CelestiaContent/data/nearstars.stc

# Nearby stars and star orbits out to 25 light years, supplementary
# to Celestia's stars.dat.

# Because the RECONS survey tabulation has not been updated since 2010,
# the data mostly comes from the SIMBAD database, with most parallaxes
# coming from Gaia DR2. Gaia DR2 does not provide parallaxes for the brightest
# stars, so for those the Hipparcos parallaxes have been used. In some cases
# where Gaia DR2 parallaxes exist for one of the component stars, that has been
# used; if two or more components have them, the average of the derived distances
# have been used.

# Most brown dwarfs in this file do not have Gaia parallaxes, in which case the
# parallax comes from Martin et al. (2018), ApJ 867 (2), 109
# "Y Dwarf Trigonometric Parallaxes from the Spitzer Space Telescope"
# https://arxiv.org/abs/1809.06479
# Other sources are appear as comments for individual star systems.

# Because the magnitude system breaks down for extremely dim stars (such as late
# T or Y dwarfs), they have been given an arbitrary but extremely low AbsMag
# value of 40, and their radii have also been set to a value around ~1 Jupiter
# radius, if their radii are not known.

# Orbits are taken from the Sixth Catalog of Orbits of Visual Binary Stars
# (http://ad.usno.navy.mil/wds/orb6.html), with other sources in the comments
# below.

# For binary orbits, the direction of an orbit's node on the plane of the
# sky is often unknown - the orbits given below will appear correct when
# viewed from Earth, but the true orbit may be tilted either towards or away from
# the Earth.
# For a few orbits the nature of the node is known - these are
# marked with the phrase "fully specified orientation".
# Barycenter positions are based on mass estimates from the papers themselves. The 
# values used are listed below.

Barycenter "Solar System Barycenter:SSB"
{
	RA 0
	Dec 0
	Distance 0
}

0 "Sol:Sun"
{
	OrbitBarycenter "Solar System Barycenter"
	CustomOrbit "vsop87-sun"

	SpectralType "G2V"
	AbsMag 4.83
	Temperature 5772
	BoloCorrection -0.08

	UniformRotation
	{
	    Period         609.12  # 25.38 days
	    Inclination      7.25
	    AscendingNode   75.77
	    MeridianAngle   23.00  # standard meridian
	}
}

70890 # Proxima Cen
{
	RA  217.42893801
	Dec -62.67949189
	Distance 4.2441 # 768.5004 +/- 0.2030 mas
	SpectralType "M5.5Ve"
	AppMag 11.09
}

# Distance from the same source as orbits
Barycenter "ALF Cen:Gliese 559"
{
	RA  219.8993053 # mass ratio 1.133:0.972
	Dec -60.8356249
	Distance 4.3897 # 743 +/- 1.3 mas
}

71683 # ALF Cen A
{
	OrbitBarycenter "ALF Cen"
	SpectralType "G2V"
	AppMag 0.01
 
	EllipticalOrbit {              # fully specified orientation
		Period           79.91
		SemiMajorAxis    10.68 # mass ratio 1.133:0.972
		Eccentricity      0.52
		Inclination      82.61
		AscendingNode   231.75
		ArgOfPericenter 280.23
		MeanAnomaly     199.75
	}			 
}

71681 # ALF Cen B
{
	OrbitBarycenter "ALF Cen"
	SpectralType "K1V"
	AppMag 1.33

	EllipticalOrbit {              # fully specified orientation
		Period           79.91
		SemiMajorAxis    12.79 # mass ratio 1.133:0.972
		Eccentricity      0.52
		Inclination      82.61
		AscendingNode   231.75
		ArgOfPericenter 100.23
		MeanAnomaly     199.75
	}
}

87937 # Barnard's Star
{
	RA 269.45208250
	Dec 4.69336427
	Distance 5.9577 # 547.4506 +/- 0.2899 mas
	SpectralType "M4V"
	AppMag 9.511
}

# Lazorenko & Sahlmann (2018), A&A 618, A111
# "Updated astrometry and masses of the LUH 16 brown dwarf binary"
# https://arxiv.org/abs/1808.07835
Barycenter "Luhman 16:WISE 1049-5319:WISE J104915.57-531906.1"
{
	RA 162.328812
	Dec -53.319467
	Distance 6.5029 # 501.557 +/- 0.082 mas
}

"Luhman 16 A:WISE 1049-5319 A:WISE J104915.57-531906.1 A"
{
	OrbitBarycenter "Luhman 16"
	SpectralType "L7.5"
	AbsMag 23 # for approximate radius in Celestia

	EllipticalOrbit {              # fully specified orientation
		Period           27.54
		SemiMajorAxis     1.64 # mass ratio 33.51J:28.55J
		Eccentricity      0.34
		Inclination     135.69
		AscendingNode   118.66
		ArgOfPericenter 136.22
		MeanAnomaly     127.58
	}
}

"Luhman 16 B:WISE 1049-5319 B:WISE J104915.57-531906.1 B"
{
	OrbitBarycenter "Luhman 16"
	SpectralType "T0.5"
	AbsMag 24 # for approximate radius in Celestia

	EllipticalOrbit {              # fully specified orientation
		Period           27.54
		SemiMajorAxis     1.92 # mass ratio 33.51J:28.55J
		Eccentricity      0.34
		Inclination     135.69
		AscendingNode   118.66
		ArgOfPericenter 316.22
		MeanAnomaly     127.58
	}
}

"WISE 0855-0714:WISE J085510.83-071442.5"
{
	RA 133.795125
	Dec -7.2451389
	Distance 7.264 # 449 +/- 8 mas
	SpectralType "Y4"
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

# Parallax from Weinberger, et al. (2016), AJ 152 (1), 24
# "Trigonometric Parallaxes and Proper Motions of 134 Southern Late M, L, 
# and T Dwarfs from the Carnegie Astrometric Planet Search Program"
# http://iopscience.iop.org/article/10.3847/0004-6256/152/1/24
"CN Leo:Gliese 406:Wolf 359"
{
	RA 164.1201092
	Dec 7.014540
	Distance 7.8948 # 413.13 +/- 1.27 mas
	SpectralType "M6V"
	AppMag 13.507
}

54035 # Lalande 21185
{
	RA 165.83414166
	Dec 35.96988004
	Distance 8.3067 # 392.64 +/- 0.67 mas
	SpectralType "M2V"
	AppMag 7.520
}

# Parameters from Bond et al. (2017), ApJ 840 (2), 70
# "The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and 
# Ground-based Astrometry"
# https://iopscience.iop.org/article/10.3847/1538-4357/aa6af8
Barycenter 32349 "Sirius:Alhabor:ALF CMa:9 CMa:Gliese 244:ADS 5423"
{
	RA 101.28715533
	Dec -16.71611586
	Distance 8.608 # 378.9 +/- 1.4 mas
}

"Sirius A:Alhabor A:ALF CMa A:9 CMa A:Gliese 244 A:ADS 5423 A"
{
	OrbitBarycenter "Sirius"
	SpectralType "A1V"
	AppMag -1.46

	EllipticalOrbit {              # fully specified orientation
		Period         50.1284
		SemiMajorAxis     9.13 # mass ratio 2.063:1.018
		Eccentricity   0.59142
		Inclination      97.01
		AscendingNode   161.67
		ArgOfPericenter   5.90
		MeanAnomaly      38.99
	}
}

"Sirius B:Alhabor B:ALF CMa B:9 CMa B:Gliese 244 B:ADS 5423 B"
{
	OrbitBarycenter "Sirius"
	SpectralType "DA2"
	AppMag 8.44

	EllipticalOrbit {              # fully specified orientation
		Period         50.1284
		SemiMajorAxis    10.65 # mass ratio 2.063:1.018
		Eccentricity   0.59142
		Inclination      97.01
		AscendingNode   161.67
		ArgOfPericenter 185.90
		MeanAnomaly      38.99
	}
}

# Distance and radii from same source as orbit
# Rotation periods from Barnes et al. (2017), MNRAS 471 (1), 811
# "Surprisingly different star-spot distributions on the near equal-mass 
# equal-rotation-rate stars in the M dwarf binary GJ 65 AB"
# https://arxiv.org/abs/1706.03979
Barycenter "Gliese 65:Luyten 726-8"
{
	RA 24.75626394 # mass ratio 0.1225:0.1195
	Dec -17.950491
	Distance 8.791 # 373.70 +/- 2.70 mas
}

"BL Cet:Gliese 65 A:Luyten 726-8 A"
{
 	OrbitBarycenter "Gliese 65"
	SpectralType "M5.5V"
	AppMag 12.7
	Radius 114790

	EllipticalOrbit {              # fully specified orbit
	 	Period          26.284
	 	SemiMajorAxis     2.72 # mass ratio 0.1225:0.1195
	 	Eccentricity      0.62
	 	Inclination      81.85
		AscendingNode   337.40
		ArgOfPericenter 346.32
		MeanAnomaly      21.93
	}

	RotationPeriod 5.76
}

"UV Cet:Gliese 65 B:Luyten 726-8 B"
{
	OrbitBarycenter "Gliese 65"
	SpectralType "M6V"
	AppMag 13.2
	Radius 110600

	EllipticalOrbit {              # fully specified orbit
		Period          26.284
		SemiMajorAxis     2.79 # mass ratio 0.1225:0.1195
		Eccentricity      0.62
	 	Inclination      81.85
		AscendingNode   337.40
		ArgOfPericenter 166.32
		MeanAnomaly      21.93
	}

	RotationPeriod 5.52
}

92403 # Ross 154
{
	RA 282.45568250
	Dec -23.83623710
	Distance 9.7035 # 336.1228 +/- 0.0641 mas
	SpectralType "M3.5Ve"
	AppMag 10.495
}

"HH And:Gliese 905:Ross 248"
{
	RA 355.47931716
	Dec 44.17745144
	Distance 10.2903 # 316.9558 +/- 0.1260 mas
	SpectralType "M5.0V"
	AppMag 12.28
}

16537 # Eps Eri
{
	RA 53.23268735
	Dec -9.45825866
	Distance 10.489 # 310.94 +/- 0.16 mas
	SpectralType "K2V"
	AppMag 3.73
}

114046 # Lacaille 9352
{
	RA 346.46681439
	Dec -35.85307188
	Distance 10.7211 # 304.2190 +/- 0.0451 mas
	SpectralType "M2V"
	AppMag 7.34
}

57548 # Ross 128
{
	RA 176.93498695
	Dec 0.80455693
	Distance 11.0074 # 296.3073 +/- 0.0699 mas
	SpectralType "M4V"
	AppMag 11.153
}

# Segransan et al. (2000), A&A 364, 665
# "Accurate masses of very low mass stars. III. 16 new or improved masses"
# http://adsabs.harvard.edu/abs/2000A%26A...364..665S
Barycenter "Gliese 866:Luyten 789-6"
{
	RA 339.6399000
	Dec -15.2999325
	Distance 11.109 # 293.6 +/- 0.9 mas
}

Barycenter "Gliese 866 A:Luyten 789-6 A"
{
	OrbitBarycenter "Gliese 866"

	EllipticalOrbit {               # fully specified orientation
		Period            2.2537
		SemiMajorAxis     0.415 # mass ratio (0.1187:0.0930):0.1145
		Eccentricity      0.439
		Inclination	 89.43
		AscendingNode   358.27
		ArgOfPericenter  61.70
		MeanAnomaly     243.55
	}
}

"EZ Aqr:Gliese 866 Aa:Luyten 789-6 Aa"
{
	OrbitBarycenter "Gliese 866 A"
	SpectralType "M5V"
	AppMag 13.03

	EllipticalOrbit {
		Period          0.01037 # 3.786516 d
		SemiMajorAxis   0.01244 # to match period and mass ratio 0.1187:0.0930
		Inclination	 90     # plane-of-sky inclination 116.5 deg
		AscendingNode     2     # guess - to roughly match plane of B
	}
}

"Gliese 866 Ab:Luyten 789-6 Ab"
{
	OrbitBarycenter "Gliese 866 A"
	SpectralType "M7V" # from mass
	AppMag 15.07

	EllipticalOrbit {
		Period          0.01037 # 3.786516 d
		SemiMajorAxis   0.01589 # to match period and mass ratio 0.1187:0.0930
		Inclination	 90     # guess - to match plane of B
		AscendingNode     2     # guess - to match plane of B
		ArgOfPericenter 180
	}
}

"Gliese 866 B:Luyten 789-6 B"
{
	OrbitBarycenter "Gliese 866"
	SpectralType "M6V" # from apparent magnitude
	AppMag 13.27

	EllipticalOrbit {               # fully specified orientation
		Period            2.2537
		SemiMajorAxis     0.768 # mass ratio (0.1187:0.0930):0.1145
		Eccentricity      0.439
		Inclination	 89.43
		AscendingNode   358.27
		ArgOfPericenter 241.70
		MeanAnomaly     243.55
	}
}

# Physical parameters from Kervella et al. (2008), A&A 488 (2), 667
# "The radii of the nearby K5V and K7V stars 61 Cygni A & B. CHARA/FLUOR 
# interferometry and CESAM2k modeling"
# https://arxiv.org/abs/0806.4049
Barycenter "61 Cyg:Gliese 820:ADS 14636"
{
	RA 316.7273265  # mass ratio 0.690:0.605
	Dec 38.7459723
	Distance 11.402
}

104214 "61 Cyg A:V1803 Cyg:Gliese 820 A:ADS 14636 A"
{
	OrbitBarycenter "61 Cyg"
	SpectralType "K5V"
	AppMag 5.21
	Radius 462600

	EllipticalOrbit {
		Period          618.7
		SemiMajorAxis   41.23 # mass ratio 0.69:0.605
		Eccentricity    0.54
		Inclination     101
		AscendingNode   295
		ArgOfPericenter 281
		MeanAnomaly     175
	}
}

104217 "61 Cyg B:Gliese 820 B:ADS 14636 B"
{
	OrbitBarycenter "61 Cyg"
	SpectralType "K7V"
	AppMag 6.03
	Radius 413900

	EllipticalOrbit {
		Period          618.7
		SemiMajorAxis   47.02 # mass ratio 0.69:0.605
		Eccentricity    0.54
		Inclination     101
		AscendingNode   295
		ArgOfPericenter 101
		MeanAnomaly     175
	}
}

# Parameters from Bond et al. (2015), ApJ 813 (2), 106
# "Hubble Space Telescope Astrometry of the Procyon System"
# https://iopscience.iop.org/article/10.1088/0004-637X/813/2/106
Barycenter 37279 "Procyon:Elgomaisa:ALF CMi:10 CMi:Gliese 280:ADS 6251"
{
	RA 114.82549791
	Dec 5.22498756
	Distance 11.444 # 250.0 +/- 0.7 mas
}

"Procyon A:Elgomaisa A:ALF CMi A:10 CMi A:Gliese 280 A:ADS 6251 A"
{
	OrbitBarycenter "Procyon"
	SpectralType "F5IV"
	AppMag 0.37

	EllipticalOrbit {             # fully specified orientation
		Period          40.84
		SemiMajorAxis    4.32 # mass ratio 1.478:0.592
		Eccentricity     0.40
		Inclination     42.58
		AscendingNode   25.26
		ArgOfPericenter 90.19
		MeanAnomaly    281.41
	}
}

"Procyon B:Elgomaisa B:ALF CMi B:10 CMi B:Gliese 280 B:ADS 6251 B"
{
	OrbitBarycenter "Procyon"
	SpectralType "DA"
	AppMag 10.7

	EllipticalOrbit {              # fully specified orientation
		Period           40.84
		SemiMajorAxis    10.79 # mass ratio 1.478:0.592
		Eccentricity      0.40
		Inclination      42.58
		AscendingNode    25.26
		ArgOfPericenter 270.19
		MeanAnomaly     281.41
	}
}

# masses from Mann et al. (2015), ApJ 804 (1), 64
# "How to Constrain Your M Dwarf: Measuring Effective Temperature, 
# Bolometric Luminosity, Mass, and Radius"
# http://iopscience.iop.org/article/10.1088/0004-637X/804/1/64/meta
Barycenter "Gliese 725:Struve 2398:ADS 11632"
{
	RA 280.6949398  # mass ratio 0.334:0.248
	Dec 59.6288903
	Distance 11.488
}

91768 "Gliese 725 A:Struve 2398 A:ADS 11632 A"
{
	OrbitBarycenter "ADS 11632"
	SpectralType "M3V"
	AppMag 8.91

	EllipticalOrbit {
		Period            408
		SemiMajorAxis   20.83 # mass ratio 0.334:0.248
		Eccentricity     0.53
		Inclination     111.9
		AscendingNode   146.1
		ArgOfPericenter 243.5
		MeanAnomaly     198.5
	}
}

91772 "Gliese 725 B:Struve 2398 B:ADS 11632 B"
{
	OrbitBarycenter "ADS 11632"
	SpectralType "M3.5V"
	AppMag 9.69

	EllipticalOrbit {
		Period           408
		SemiMajorAxis  28.06 # mass ratio 0.334:0.248
		Eccentricity    0.53
		Inclination    111.9
		AscendingNode  146.1
		ArgOfPericenter 63.5
		MeanAnomaly    198.5
	}
}

# Pinamonti et al. (2018), A&A 617, A104
# "The HADES RV Programme with HARPS-N at TNG. VIII. GJ15A: a multiple
# wide planetary system sculpted by binary interaction"
# https://arxiv.org/abs/1804.03476
Barycenter 1475 "Gliese 15:Groombridge 34:ADS 246"
{
	RA 4.600573040  # mass ratio 0.38:0.15
	Dec 44.02478402
	Distance 11.619
}

"GX And:Gliese 15 A:Groombridge 34 A:ADS 246 A"
{
	OrbitBarycenter "Groombridge 34"
	SpectralType "M2V"
	AppMag 8.13
	Radius 264400

	EllipticalOrbit {
		Period         1230
		SemiMajorAxis 26.32 # mass ratio 0.38:0.15
		Eccentricity   0.53
		Inclination     172
		AscendingNode   194
		ArgOfPericenter  75
		MeanAnomaly     296
	}
}

"GQ And:Gliese 15 B:Groombridge 34 B:ADS 246 B"
{
	OrbitBarycenter "Groombridge 34"
	SpectralType "M3.5V"
	AppMag 11.04
	Radius 125200

	EllipticalOrbit {
		Period         1230
		SemiMajorAxis 66.68 # mass ratio 0.38:0.15
		Eccentricity   0.53
		Inclination     172
		AscendingNode   194
		ArgOfPericenter 255
		MeanAnomaly     296
	}
}

"DX Cnc:GJ 1111:Giclas 51-15"
{
	RA 127.45563677
	Dec 26.77600744
	Distance 11.6780 # 279.2901 +/- 0.1345 mas
	SpectralType "M6.5V"
	AppMag 14.81
}

Barycenter "EPS Ind:Gliese 845" # orbit of A & B components unknown
{
	RA 330.87262069 # mass ratio 0.732:(0.0716:0.0669)
	Dec -56.7854593
	Distance 11.870
}

108870 "EPS Ind A:Gliese 845 A"
{
	RA 330.84022596
	Dec -56.7859825
	Distance 11.8686 # 274.8048 +/- 0.2494 mas
	SpectralType "K5V"
	AppMag 4.69
}

# Dieterich et al. (2018) "Dynamical Masses of ε Indi B and C: Two Massive
# Brown Dwarfs at the Edge of the Stellar–substellar Boundary"
# https://arxiv.org/abs/1807.09880
Barycenter "EPS Ind B:CI Ind:Gliese 845 B"
{
	RA 331.0438333
	Dec -56.782694
	Distance 11.780 # 276.88 +/- 0.81 mas
}

"EPS Ind Ba:CI Ind A:Gliese 845 Ba"
{
	OrbitBarycenter "EPS Ind B"
	SpectralType "T1.5V"
	Temperature 1280
	AbsMag 34.5 # for approx. radius in Celestia

	EllipticalOrbit {
		Period          11.41
		SemiMajorAxis    1.26 # mass ratio 75.0J:70.1J
		Eccentricity     0.47
		Inclination     77.95
		AscendingNode  138.03
		ArgOfPericenter 87.11
		MeanAnomaly     49.82
	}
}

"EPS Ind Bb:CI Ind B:Gliese 845 Bb"
{
	OrbitBarycenter "EPS Ind B"
	SpectralType "T6V"
	Temperature 850
	Radius 60000 # approx.
	AbsMag 40 # extremely low

	EllipticalOrbit {
		Period           11.41
		SemiMajorAxis     1.35 # mass ratio 75.0J:70.1J
		Eccentricity      0.47
		Inclination      77.95
		AscendingNode   138.03
		ArgOfPericenter 267.11
		MeanAnomaly      49.82
	}
}

8102 # Tau Cet
{
	RA 26.01701426
	Dec -15.93747960
	Distance 11.905 # 273.96 +/- 0.17 mas
	SpectralType "G8V"
	AppMag 3.50
}

"GJ 1061:Luyten 372-58"
{
	RA 53.99874864
	Dec -44.51270146
	Distance 11.9803 # 272.2446 +/- 0.0661 mas
	SpectralType "M5.5V"
	AppMag 13.03
}

5643 # YZ Cet
{
	RA 18.12765323
	Dec -16.99898925
	Distance 12.1084 # 269.3628 +/- 0.0785 mas
	SpectralType "M4.0Ve"
	AppMag 12.074
}

36208 # Luyten's Star
{
	RA 111.85208229
	Dec 5.22578699
	Distance 12.402 # 262.98 +/- 1.39 mas
	SpectralType "M3.5V"
	AppMag 9.872
}

"Teegarden's Star:SO0253+1652:SO025300.5+165258"
{
	RA 43.25371387
	Dec 16.88128947
	Distance 12.4957 # 261.0147 +/- 0.2690 mas
	SpectralType "M7.0V"
	AppMag 15.40
}

24186 # Kapteyn's Star
{
	RA 77.91912216
	Dec -45.01843165
	Distance 12.8294 # 254.2263 +/- 0.0263 mas
	SpectralType "M1VI"
	AppMag 8.853
}

105090 # Lacaille 8760
{
	RA 319.31362024
	Dec -38.86736390
	Distance 12.9515 # 251.8295 +/- 0.0559 mas
	SpectralType "M1V"
	AppMag 6.68
}

# used Gaia DR2 parallax for A
# parameters from Vigan et al. (2012), A&A 540, A131
# "High-contrast spectroscopy of SCR J1845-6357 B"
# https://www.aanda.org/articles/aa/abs/2012/04/aa18426-11/aa18426-11.html
Barycenter "SCR 1845-6357"
{
	RA 281.27187786
	Dec -63.96318293
	Distance 13.0505 # 249.9187 +/- 0.1551 mas
}

"SCR 1845-6357 A"
{
	OrbitBarycenter "SCR 1845-6357"
	SpectralType "M8.5V"
	AppMag 17.40

	EllipticalOrbit {
		Period 		24  # estimate
		SemiMajorAxis	1.6 # estimated mass ratio 0.07:0.045
		ArgOfPericenter 180
	}
}

"SCR 1845-6357 B"
{
	OrbitBarycenter "SCR 1845-6357"
	SpectralType "T6V"
	AbsMag 33.5 # for approximate radius in Celestia

	EllipticalOrbit {
		Period 		24  # estimate
		SemiMajorAxis	2.4 # estimated mass ratio 0.07:0.045
	}
}

Barycenter 110893 "Gliese 860:Kruger 60:ADS 15972"
{
	RA 336.9985152  # mass ratio 0.30:0.17
	Dec 57.69579262 # only used parallax of A
	Distance 13.0780 # 249.3926 +/- 0.1653 mas
}

1000923991 "Gliese 860 A:Kruger 60 A:ADS 15972 A"
{
	OrbitBarycenter "Kruger 60"
	SpectralType "M3V"
	AppMag 9.93

	EllipticalOrbit {
		Period          44.581
		SemiMajorAxis     3.48 # mass ratio 0.30:0.17
		Eccentricity     0.408
		Inclination      37.20
		AscendingNode   129.48
		ArgOfPericenter 262.00
		MeanAnomaly     240.36
	}
}

2000923991 "DO Cep:Gliese 860 B:Kruger 60 B:ADS 15972 B"
{
	OrbitBarycenter "Kruger 60"
	SpectralType "M4V"
	AppMag 11.41

	EllipticalOrbit {
		Period          44.67
		SemiMajorAxis    6.15 # mass ratio 0.30:0.17
		Eccentricity    0.408
		Inclination     37.20
		AscendingNode  129.48
		ArgOfPericenter 82.00
		MeanAnomaly    240.36
	}
}

"DENIS 1048-3956:DENIS J104814.6-395606:RECONS 2"
{
	RA 162.06072261
	Dec -39.93523423
	Distance 13.1932 # 247.2157 +/- 0.1236 mas
	SpectralType "M9V"
	AppMag 17.532
}

# masses and parallaxes from Benedict et al. (2016), AJ 152 (5), 141
# "The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence
# M Dwarfs"
# http://iopscience.iop.org/article/10.3847/0004-6256/152/5/141/meta
Barycenter 30920 "Gliese 234:Ross 614"
{
	RA 97.34746466
	Dec -2.81355664
	Distance 13.4239 # 242.9659 +/- 0.8833 mas
}

"V577 Mon:Gliese 234 A:Ross 614 A"
{
	OrbitBarycenter "Ross 614"
	SpectralType "M4.5V"
	AppMag 11.15

	EllipticalOrbit {              # fully specified orientation
		Period           16.63
		SemiMajorAxis     1.48 # mass ratio 0.223:0.109
		Eccentricity      0.38
		Inclination      93.87
		AscendingNode   322.71
		ArgOfPericenter 167.29
		MeanAnomaly      15.85
	}
}

"Gliese 234 B:Ross 614 B"
{
	OrbitBarycenter "Ross 614"
	SpectralType "M7V"
	AppMag 14.23

	EllipticalOrbit {              # fully specified orientation
		Period           16.63
		SemiMajorAxis     3.02 # mass ratio 0.223:0.109
		Eccentricity      0.38
		Inclination      93.87
		AscendingNode   322.71
		ArgOfPericenter 347.29
		MeanAnomaly      15.85
	}
}

# low-quality parallax from Theissen, C. A. (2018), ApJ 862 (2), 173
# "Parallaxes of Cool Objects with WISE: Filling in for Gaia"
# http://iopscience.iop.org/article/10.3847/1538-4357/aaccfa/meta
"UGPS 0722-0540:UGPS J072227.51-054031.2"
{
	RA 110.6161250
	Dec -5.6753056
	Distance 13.433 # 242.8 +/- 2.40 mas
	SpectralType "T9V"
	Temperature 505
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

# masses and parallaxes from Benedict et al. (2016), AJ 152 (5), 141
# "The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence
# M Dwarfs"
# http://iopscience.iop.org/article/10.3847/0004-6256/152/5/141/meta
Barycenter "Gliese 473:Wolf 424"
{
	RA 188.3223395
	Dec 9.0210534
	Distance 13.850 # 235.5 +/- 2.9 mas
}

"Gliese 473 A:Wolf 424 A"
{
	OrbitBarycenter "Wolf 424"
	SpectralType "M5.5V"
	AppMag 13.18

	EllipticalOrbit {
		Period          15.81
		SemiMajorAxis    1.86 # mass ratio 0.124:0.113
		Eccentricity     0.30
		Inclination     29.15
		AscendingNode  357.44
		ArgOfPericenter 80.72
		MeanAnomaly    172.43
	}
}

"FL Vir:Gliese 473 B:Wolf 424 B"
{
	OrbitBarycenter "Wolf 424"
	SpectralType "M5.5V"
	AppMag 13.17

	EllipticalOrbit {
		Period           15.81
		SemiMajorAxis     2.04 # mass ratio 0.124:0.113
		Eccentricity      0.30
		Inclination      29.15
		AscendingNode   357.44
		ArgOfPericenter 260.72
		MeanAnomaly     172.43
	}
}

80824 # Wolf 1061
{
	RA 247.57524250
	Dec -12.66258979
	Distance 14.0458 # 232.2095 +/- 0.0630 mas
	SpectralType "M3V"
	AppMag 10.072
}

3829 # van Maanen's Star
{
	RA 12.29124338
	Dec 5.38860920
	Distance 14.0744 # 231.7375 +/- 0.0380 mas
	SpectralType "DZ7.5"
	AppMag 12.374
}

439 # Gliese 1
{
	RA 1.35178251
	Dec -37.35736228
	Distance 14.1725 # 230.1331 +/- 0.0600 mas
	SpectralType "M2V"
	AppMag 8.562
}

# parameters and low-quality parallax from Martin et al. (2018)
"WISE 1639-6847:WISE J163940.83-684738.6"
{
	RA 249.921736
	Dec -68.797280
	Distance 14.302 # 228.05 +/- 8.93 mas
	SpectralType "Y0Vpec"
	Temperature 370 # approx.
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

"TZ Ari:Gliese 83.1:GJ 9066:Luyten 1159-16"
{
	RA 30.05398414
	Dec 13.05195036
	Distance 14.5843 # 223.6349 +/- 0.1066 mas
	SpectralType "M4.5V"
	AppMag 12.298
}

85523 # Gliese 674
{
	RA 262.16643984
	Dec -46.89519257
	Distance 14.8387 # 219.8012 +/- 0.0487 mas
	SpectralType "M3V"
	AppMag 9.407
}

86162 # Gliese 687
{
	RA 264.10791321
	Dec 68.33914004
	Distance 14.8401 # 219.7807 +/- 0.0324 mas
	SpectralType "M3.0V"
	AppMag 9.15
}

"GJ 3622:LP 731-58"
{
	RA 162.05255937
	Dec -11.33600262
	Distance 14.8851 # 219.1159 +/- 0.1567 mas
	SpectralType "M6.5V"
	AppMag 15.784
}

57367 # Luyten 145-141
{
	RA 176.42882111
	Dec -64.84151780
	Distance 15.1182 # 215.7373 +/- 0.0324 mas
	SpectralType "DQ6"
	AppMag 11.513
}

113020 # Gliese 876
{
	RA 343.31971796
	Dec -14.26369539
	Distance 15.2504 # 213.8669 +/- 0.0758 mas
	SpectralType "M3.5V"
	AppMag 10.192
}

# masses from Benedict et al. (2016), AJ 152 (5), 141
# "The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence
# M Dwarfs"
# http://iopscience.iop.org/article/10.3847/0004-6256/152/5/141/meta
Barycenter "GJ 1245" # orbit of A & B components unknown
{
	RA 298.477317   # mass ratio (0.111:0.076):0.10
	Dec 44.415377
	Distance 15.268
}

Barycenter "GJ 1245 A"
{
	RA 298.47700882
	Dec 44.41426155
	Distance 15.3029 # 213.1329 +/- 0.5737 mas
}

"V1581 Cyg:GJ 1245 Aa"
{
	OrbitBarycenter "GJ 1245 A"
	SpectralType "M5.5V"
	AppMag 13.46

	EllipticalOrbit {
		Period           16.84
		SemiMajorAxis     1.53 # mass ratio 0.111:0.076
		Eccentricity      0.33
		Inclination      70.45
		AscendingNode    37.06
		ArgOfPericenter 208.50
		MeanAnomaly       2.21
	}
}

"GJ 1245 Ab"
{
	OrbitBarycenter "GJ 1245 A"
	SpectralType "M7.5V"
	AppMag 16.75

	EllipticalOrbit {
		Period          16.84
		SemiMajorAxis    2.23 # mass ratio 0.111:0.076
		Eccentricity     0.33
		Inclination     70.45
		AscendingNode   37.06
		ArgOfPericenter 28.50
		MeanAnomaly      2.21
	}
}

"GJ 1245 B"
{
	RA 298.47974513
	Dec 44.41504008
	Distance 15.2034 # 214.5285 +/- 0.0824 mas
	SpectralType "M6V"
	AppMag 13.99
}

"GJ 3618:Luyten 143-23"
{
	RA 161.08847255
	Dec -61.20979537
	Distance 15.7703 # 206.8172 +/- 0.0735 mas 
	SpectralType "M5.0V"
	AppMag 13.920
}

"GJ 1002"
{
	RA 1.67998846
	Dec -7.53806229
	Distance 15.8164 # 206.2134 +/- 0.1281 mas
	SpectralType "M5.5V"
	Radius 122000 # approx. for class
	AppMag 13.837
}

# masses from Mann et al. (2015), ApJ 804 (1), 64
# "How to Constrain Your M Dwarf: Measuring Effective Temperature, 
# Bolometric Luminosity, Mass, and Radius"
# http://iopscience.iop.org/article/10.1088/0004-637X/804/1/64/meta
Barycenter 54211 "Gliese 412:Lalande 21258" # orbits of A & B unknown
{
	RA 166.3709615  # mass ratio 0.39:0.0952
	Dec 43.52576672
	Distance 15.846
}

"Gliese 412 A:Lalande 21258 A"
{
	RA 166.36907492
	Dec 43.52677540
	Distance 15.812 # 206.27 +/- 1.00 mas
	SpectralType "M1.0Ve"
	AppMag 8.780
}

"WX UMa:Gliese 412 B:Lalande 21258 B"
{
	RA 166.37869018
	Dec 43.52163453
	Distance 15.9834 # 204.0592 +/- 0.1687 mas
	SpectralType "M6.0V"
	AppMag 14.45
}

49908 # Groombridge 1618
{
	RA 152.84225009
	Dec 49.45423588
	Distance 15.8797 # 205.3917 +/- 0.0342 mas
	SpectralType "K6Ve"
	AppMag 6.61
}

"DENIS 0255-4700:DENIS-P J025503.5-470050:2MASS 0255-4700:2MASS J02550357-4700509"
{
	RA 43.76539377
	Dec -47.01426260
	Distance 15.8847 # 205.3266 +/- 0.2545 mas
	SpectralType "L9V"
	Radius 60000 # approx.
	AppMag 22.921
}

106440 # Gliese 832
{
	RA 323.39156247
	Dec -49.00900096
	Distance 16.1939 # 201.4073 +/- 0.0429 mas
	SpectralType "M2V"
	Radius 306000 # approx. for class
	AppMag 8.672
}

1001741423 "AD Leo:Gliese 388"
{
	RA 154.90117001
	Dec 19.87000390
	Distance 16.1970 # 201.3683 +/- 0.0679 mas
	SpectralType "M4Vae"
	Radius 180000 # approx. for class
	AppMag 9.52
}

# mass of component A from Ma et al. (2018), MNRAS 480 (2), 2411
# "The first super-Earth detection from the high cadence and high radial velocity 
# precision Dharma Planet Survey"
# https://arxiv.org/abs/1807.07098
Barycenter 19849 "Keid:OMI2 Eri:40 Eri:Gliese 166:ADS 3093" # Orbits of A & (BC) unknown
{
	RA 63.82884851   # mass ratio 0.78:(0.573:0.2036)
	Dec -7.654310215
	Distance 16.305
}

"Keid A:OMI2 Eri A:40 Eri A:Gliese 166 A:ADS 3093 A"
{
	RA 63.81799886
	Dec -7.65287169
	Distance 16.257 # 200.62 +/- 0.23 mas
	SpectralType "K0V"
	AppMag 4.43
}

Barycenter "Keid BC:OMI2 Eri BC:40 Eri BC:Gliese 166 BC"
{
	RA 63.83974566
	Dec -7.65575504
	Distance 16.3523 # 199.4552 mas
}

# radius from Bond et al. (2017), ApJ 848 (1), 16
# "Astrophysical Implications of a New Dynamical Mass for the 
# Nearby White Dwarf 40 Eridani B"
# http://iopscience.iop.org/article/10.3847/1538-4357/aa8a63/meta
"Keid B:OMI2 Eri B:40 Eri B:Gliese 166 B:ADS 3093 B"
{
	OrbitBarycenter "Keid BC"
	SpectralType "DA3"
	Radius 9100
	AppMag 9.53

	EllipticalOrbit {	
		Period         222.74
		SemiMajorAxis   8.855 # mass ratio 0.573:0.2036
		Eccentricity    0.451
		Inclination     83.57
		AscendingNode  216.91
		ArgOfPericenter 77.11
		MeanAnomaly    245.29
	}
}

"Keid C:OMI2 Eri C:40 Eri C:DY Eri:Gliese 166 C:ADS 3093 C"
{
	OrbitBarycenter "Keid BC"
	SpectralType "M4.5V"
	Radius 180000 # approx. for class
	AppMag 11.17

	EllipticalOrbit {
		Period          222.74
		SemiMajorAxis    24.92 # mass ratio 0.573:0.2036
		Eccentricity     0.451
		Inclination      83.57
		AscendingNode   216.91
		ArgOfPericenter 257.11
		MeanAnomaly     245.29
	}
}

86214 # Gliese 682
{
	RA 264.26527385
	Dec -44.31921360
	Distance 16.3320 # 199.7031 +/- 0.0832 mas
	SpectralType "M3.5V"
	Radius 180000 # approx. for class
	AppMag 10.946
}

112460 # EV Lac
{
	RA 341.70721323
	Dec 44.33399228
	Distance 16.4716 # 198.0112 +/- 0.0380 mas
	SpectralType "M4.0V"
	Radius 225000 # approx. for class
	AppMag 10.26
}

# Eggenberger et al. (2008), A&A 482 (2), 631
# "Analysis of 70 Ophiuchi AB including seismic constraints"
# https://www.aanda.org/articles/aa/abs/2008/17/aa8624-07/aa8624-07.html
Barycenter 88601 "70 Oph:Gliese 702:Struve 2272:ADS 11046"
{
	RA 271.36368827
	Dec 2.50009883
	Distance 16.580 # 196.72 +/- 0.83 mas
}

1052130434 "70 Oph A:Gliese 702 A:Struve 2272 A:ADS 11046 A"
{
	OrbitBarycenter "70 Oph"
	SpectralType "K0V"
	AppMag 4.13

	EllipticalOrbit {              # fully specified orientation
		Period           88.44
		SemiMajorAxis    10.37 # mass ratio 0.89:0.73
		Eccentricity      0.50
		Inclination      28.75
		AscendingNode    73.59
		ArgOfPericenter 285.57
		MeanAnomaly      63.92
	}
}

1052120434 "70 Oph B:Gliese 702 B:Struve 2272 B:ADS 11046 B"
{
	OrbitBarycenter "70 Oph"
	SpectralType "K4V"
	AppMag 6.07

	EllipticalOrbit {              # fully specified orientation
		Period           88.44
		SemiMajorAxis    12.64 # mass ratio 0.89:0.73
		Eccentricity      0.50
		Inclination      28.75
		AscendingNode    73.59
		ArgOfPericenter 105.57
		MeanAnomaly      63.92
	}
}

# rotational parameters from Bouchaud et al. (2020), A&A 633, A78
# "A realistic two-dimensional model of Altair"
# https://arxiv.org/abs/1912.03138
97649 # Altair
{
	RA 297.69582730
	Dec 8.86832120
	Distance 16.730 # 194.95 +/- 0.57
	SpectralType "A7IV"
	AppMag 0.76
	Radius 1396700 # equatorial radius

	SemiAxes [ 1 0.779 1 ] # equatorial radius 28.3% greater than polar

	UniformRotation
	{
		Period          7.79 # from equatorial rotational velocity
		Inclination    81.21 # inclination (i) = 50.65 deg
		AscendingNode 246.44 # orientation (alpha) = 301.13 deg
	}
}

# Orbit from Tokovinin et al. (2020), AJ 160 (1), 7
# "Speckle Interferometry at SOAR in 2019"
# https://arxiv.org/abs/2005.05305
# Distance from average of distances from Gaia DR2 parallax for A and B
Barycenter "GJ 1116"
{
	RA 134.56295790 # mass ratio 0.11:0.10
	Dec 19.76308611 # A: 194.7225 +/- 0.1251 mas
	Distance 16.735 # B: 195.0836 +/- 0.1754 mas
}

"EI Cnc:GJ 1116 A"
{
	OrbitBarycenter "GJ 1116"
	SpectralType "M8Ve"
	AppMag 13.93

	EllipticalOrbit {
		Period          134.4
		SemiMajorAxis   7.902 # mass ratio 0.11:0.10
		Eccentricity    0.661
		Inclination     84.9
		AscendingNode   59.9
		ArgOfPericenter 22.9
		MeanAnomaly     343.3
	}
}

"GJ 1116 B:LP 426-40"
{
	OrbitBarycenter "GJ 1116"
	SpectralType "M7V"
	AppMag 13.75

	EllipticalOrbit {
		Period          134.4
		SemiMajorAxis   8.692 # mass ratio 0.11:0.10
		Eccentricity    0.661
		Inclination     84.9
		AscendingNode   59.9
		ArgOfPericenter 202.9
		MeanAnomaly     343.3
	}
}

# rotation period from Burningham et al. (2016), MNRAS 463 (2), 2202
# "A LOFAR mini-survey for low-frequency radio emission from the nearest brown
# dwarfs"
# https://academic.oup.com/mnras/article/463/2/2202/2892466
"WISE 1506+7027:WISE J150649.97+702736.1"
{
	RA 226.71850107
	Dec 70.45697728
	Distance 16.8516 # 193.5457 +/- 0.9420 mas
	AppMag 17.48 # calculated from J, H, and Ks bands
	SpectralType "T6"
	Radius 60000 # approx.
	RotationPeriod 1.74
	Temperature 1000
}

1006050134 "GJ 3379:Giclas 99-49"
{
	RA 90.01459942
	Dec 2.70655466
	Distance 16.9813 # 192.0675 +/- 0.0715 mas
	SpectralType "M3.5Ve"
	Radius 225000 # approx. for class
	AppMag 11.31
}

"WISE J0817-6155:WISEP J081729.74-615504.1"
{
	RA 124.37499532
	Dec -61.92101733
	Distance 17.0290 # 191.5301 +/- 0.6037 mas
	SpectralType "T6V"
	AbsMag 34 # for approximate radius in Celestia
}

57544 # Gliese 445
{
	RA 176.92245210
	Dec 78.69116094
	Distance 17.1424 # 190.2625 +/- 0.0475 mas
	SpectralType "M4.0Ve"
	Radius 181000 # approx. for class
	AppMag 10.84
}

# magnitude from Perez Garrido et al. (2014), A&A 567, A6
# "2MASS J154043.42-510135.7: a new addition to the 5 pc population"
# https://www.aanda.org/articles/aa/abs/2014/07/aa23615-14/aa23615-14.html
"WISE 1540-5101:WISE J154045.65-510139.2"
{
	RA 235.18140398
	Dec -51.02665765
	Distance 17.3441 # 191.5301 +/- 0.6037 mas
	SpectralType "M6.5"
	Radius 83500 # approx. for class
	AppMag 15.26 # measured w/ ESO Faint Object Spectrograph and Camera
}

# Leggett et al. (2009), ApJ 695, 1517
# "The phyical properties of four 600K T dwarfs."
# http://iopscience.iop.org/article/10.1088/0004-637X/695/2/1517/meta
# unresolved binary; separation and orbit unknown
"2MASS 0939-2448 A:2MASS J09393548-2448279 A"
{
	RA 144.897865
	Dec -24.807761
	Distance 17.414 # 187.30 +/- 4.60 mas
	SpectralType "T8V"
	Temperature 600
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

"2MASS 0939-2448 B:2MASS J09393548-2448279 B"
{
	RA 144.897885
	Dec -24.807761
	Distance 17.414 # 187.30 +/- 4.60 mas
	SpectralType "T8V"
	Temperature 600
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

"GJ 3323:LP 656-38:RECONS 3"
{
	RA 75.48927544
	Dec -6.94621441
	Distance 17.5331 # 186.0231 +/- 0.0590
	SpectralType "M4.0Ve"
	Radius 180000 # approx. for class
	AppMag 12.196
}

67155 # Lalande 25372
{
	RA 206.43239772
	Dec 14.89152033
	Distance 17.7274 # 183.9836 +/- 0.0509
	SpectralType "M2V"
	Radius 306000 # approx. for class
	AppMag 8.50
}

# mass ratio from Sahu et al. (2017), Science 356 (6342), 1046
# "Relativistic deflection of background starlight measures the mass of 
# a nearby white dwarf star"
# https://arxiv.org/abs/1706.02037
# orbit listed in Sixth Orbit Catalogue is of poor quality, so unused
Barycenter 21088 "Gliese 169.1:Stein 2051"
{
	RA 67.79800245  # mass ratio MB/MA 2.07
	Dec 58.97707796
	Distance 18.020
}

1004123744 "Gliese 169.1 A:Stein 2051 A"
{
	RA 67.79795272
	Dec 58.97706349
	Distance 18.0774 # 180.4215 +/- 0.5863 mas
	SpectralType "M4V"
	Radius 180000 # approx. for class
	AppMag 10.977
}

1020623744 "Gliese 169.1 B:Stein 2051 B"
{
	RA 67.80237894
	Dec 58.97813685
	Distance 17.9917 # 181.2815 +/- 0.0450 mas
	SpectralType "DC5"
	AppMag 11.19
}

33226 # Wolf 294
{
	RA 103.70399048
	Dec 33.26817738
	Distance 18.2043 # 179.1642 +/- 0.0632 mas
	SpectralType "M3V"
	Radius 270000 # approx. for class
	AppMag 10.11
}

103039 # LP 816-60
{
	RA 313.13756964
	Dec -16.97472438
	Distance 18.3106 # from 178.1243 +/- 0.0849 mas
	SpectralType "M4V"
	Radius 181000 # approx. for class
	AppMag 11.458
}

# parallax from Faherty et al. (2012), ApJ 752, (1), 56
# "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs"
# http://iopscience.iop.org/article/10.1088/0004-637X/752/1/56/meta
# radius and temperature from Line et al. (2017), ApJ 848 (2), 83
# "Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs. II. Properties 
# of 11 T dwarfs"
# http://iopscience.iop.org/0004-637X/848/2/83/
"2MASS 1114-2618:2MASS J11145133-2618235"
{
	RA 168.713904
	Dec -26.306544
	Distance 18.45 # 176.8 +/- 7.0 mas
	SpectralType "T7.5V"
	Temperature 680
	Radius 64000
	AbsMag 40 # extremely low
}

# parallax from Marsh et al. (2013), ApJ 762 (2), 119
# "Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral
# Types Y and Late T"
# http://iopscience.iop.org/article/10.1088/0004-637X/762/2/119/meta
# rotation period, radius from Burningham et al. (2016), MNRAS 463, 2
# "A LOFAR mini-survey for low-frequency radio emission from the nearest brown dwarfs"
# https://academic.oup.com/mnras/article/463/2/2202/2892466
"WISE 1741+2553:WISE J174124.25+255319.6"
{
	RA 265.352586
	Dec 25.892878
	Distance 18.53 # 176 +/- 25 mas
	SpectralType "T9V"
	Temperature 620
	Radius 60000 # approx.
	AbsMag 40 # extremely low
	RotationPeriod 2
}

"2MASS 1835+3259:2MASS J18353790+3259545"
{
	RA 278.90783482
	Dec 32.99814204
	Distance 18.5501 # from 175.8244 +/- 0.0905 mas
	SpectralType "M8.5V"
	Radius 66000 # approx. for class
	AppMag 18.27
}

25878 # Wolf 1453
{
	RA 82.86414936
	Dec -3.67722821
	Distance 18.5919 # from 175.4287 +/- 0.0672 mas
	SpectralType "M1.5Ve"
	Radius 324000 # approx. for class
	AppMag 7.968
}

# coordinates, parallax from Dupuy & Liu (2012), ApJS 201 (2), 19
# "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition"
# http://iopscience.iop.org/article/10.1088/0067-0049/201/2/19/meta
"2MASS 0415-0935:2MASS J04151954-0935066"
{
	RA 63.8381022
	Dec -9.5835266
	Distance 18.62 # 175.2 +/- 1.7 mas
	SpectralType "T8.0V"
	Temperature 750
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

96100 # Sig Dra
{
	RA 293.08995958
	Dec 69.66117632
	Distance 18.769 # 173.77 +/- 0.18 mas
	SpectralType "K0V"
	AppMag 4.680
}

# Orbit from Brandt et al. (2019), eprint arXiv 1910.01652
# "A Dynamical Mass of 70 ± 5 Jupiter Masses for Gliese 229B, the First Imaged T Dwarf"
# https://arxiv.org/abs/1910.01652
Barycenter 29295 "Gliese 229:Luyten 668-21:LPM 230"
{
	RA 92.64484913   # mass ratio 0.556:0.05
	Dec -21.86626696
	Distance 18.7775 # 173.6955 +/- 0.0457 mas
}

"Gliese 229 A:Luyten 668-21 A:LPM 230 A"
{
	OrbitBarycenter "Gliese 229"
	SpectralType "M1V"
	AppMag 8.125
	Radius 341000 # approx. for class

	EllipticalOrbit {             # fully specified orbit
		Period            263
		SemiMajorAxis    3.84 # mass ratio 0.54:70.4J
		Eccentricity    0.846
		Inclination      40.3
		AscendingNode   345.3
		ArgOfPericenter 246.9
		MeanAnomaly     300.6
	}
}

"Gliese 229 B:Luyten 668-21 B:LPM 230 B"
{
	OrbitBarycenter "Gliese 229"
	SpectralType "T6.5V"
	AbsMag 33.5 # for approximate radius in Celestia

	EllipticalOrbit {             # fully specified orbit
		Period            263
		SemiMajorAxis   30.87 # mass ratio 0.54:70.4J
		Eccentricity    0.846
		Inclination      40.3
		AscendingNode   345.3
		ArgOfPericenter  66.9
		MeanAnomaly     300.6
	}
}

26857 # Ross 47
{
	RA 85.53861374
	Dec 12.48933659
	Distance 18.8850 # 172.7068 +/- 0.0788 mas
	SpectralType "M4V"
	Radius 180000 # approx. for class
	AppMag 11.509
}

# mass and radius of A from Demory et al. (2009), A&A 505 (1), 205
# "Mass-radius relation of low and very low-mass stars revisited with the VLTI"
# https://www.aanda.org/articles/aa/full_html/2009/37/aa11976-09/aa11976-09.html
# masses of B, C from same sources as orbit
Barycenter "Gliese 570:ADS 9446"
{
	RA 224.363313679 # mass ratio 0.802:(0.586:0.390)
	Dec -21.41332223
	Distance 19.1844 # 170.0112 +/- 0.0851 mas
}

73184 "KX Lib:Gliese 570 A:ADS 9446 A"
{
	OrbitBarycenter "Gliese 570"
	SpectralType "K4V"
	AppMag 5.64
	Radius 514100

	EllipticalOrbit {             # fully specified orientation
		Period           2130
		SemiMajorAxis   104.4 # mass ratio 0.802:(0.586:0.390)
		Eccentricity     0.20
		Inclination     142.6
		AscendingNode   191.6
		ArgOfPericenter 129.2
		MeanAnomaly      52.6
	}
}

Barycenter 73182 "Gliese 570 BC"
{
	OrbitBarycenter "Gliese 570"

	EllipticalOrbit {             # fully specified orientation
		Period           2130
		SemiMajorAxis    85.8 # mass ratio 0.802:(0.586:0.390)
		Eccentricity     0.20
		Inclination     142.6
		AscendingNode   191.6
		ArgOfPericenter 309.2
		MeanAnomaly      52.6
	}
}

"Gliese 570 B:ADS 9446 B"
{
	OrbitBarycenter "Gliese 570 BC"
	SpectralType "M1.5V"
	Radius 324000 # approx. for class
	AppMag 8.33

	EllipticalOrbit {              # fully specified orientation
		Period            0.846
		SemiMajorAxis     0.35 # mass ratio 0.586:0.390
		Eccentricity      0.76
		Inclination      90.68
		AscendingNode    30.52
		ArgOfPericenter 221.92
		MeanAnomaly      45.19
	}
}

"Gliese 570 C:ADS 9446 C"
{
	OrbitBarycenter "Gliese 570 BC"
	SpectralType "M3V"
	Radius 270000 # approx. for class
	AppMag 9.94

	EllipticalOrbit {             # fully specified orientation
		Period           0.846
		SemiMajorAxis    0.53 # mass ratio 0.586:0.390
		Eccentricity     0.76
		Inclination     90.68
		AscendingNode   30.52
		ArgOfPericenter 41.92
		MeanAnomaly     45.19
	}
}

# radius and temperature from Line et al. (2015), ApJ 807 (2), 183
# "Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs. I. Characterizing
# Benchmarks, Gl 570D and HD 3651B"
# http://iopscience.iop.org/article/10.1088/0004-637X/807/2/183/meta
"Gliese 570 D:ADS 9446 D"
{
	RA 224.31233
	Dec -21.36328
	Distance 19.184
	SpectralType "T8V"
	Temperature 710
	Radius 80000
	AbsMag 40 # extremely low
}

86990 # Luyten 205-128
{
	RA 266.64263979
	Dec -57.31904446
	Distance 19.2013 # 169.8613 +/- 0.1184 mas
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 10.783
}

117473 # Gliese 908
{
	RA 357.30218808
	Dec 2.40122307
	Distance 19.2583 # 169.3585 +/- 0.0595 mas
	SpectralType "M1V"
	Radius 341000 # approx. for class
	AppMag 8.993
}

# Parameters of A from Karminski et al. (2018), A&A 618, A115
# "The CARMENES search for exoplanets around M dwarfs. A Neptune-mass
# planet traversing the habitable zone around HD 180617"
# https://arxiv.org/abs/1808.01183
# Parameters of B from Tsuji et al. (2016), PASJ 68 (1), 1331
# "Near-infrared spectroscopy of M dwarfs. III. Carbon and oxygen abundances
# in late M dwarfs, including the dusty rapid rotator 2MASSI J1835379+325954"
# https://arxiv.org/abs/1511.04682
Barycenter 94761 "Gliese 752:Ross 652:Wolf 1055" # orbit of A & B unknown
{
	RA 289.231870107 # mass ratio 0.45:0.09
	Dec 5.1658232850
	Distance 19.2810 # 169.1590 +/- 0.0520 mas
}

"V1428 Aql:Gliese 752 A:Ross 652 A:Wolf 1055 A:HD 180617 A"
{
	RA 289.23023552
	Dec 5.16889968
	Distance 19.2810
	SpectralType "M2.5V"
	Radius 315000
	AppMag 9.115
	RotationPeriod 1105
}

"Van Biesbroeck's Star:V1298 Aql:Gliese 752 B:Ross 652 B:Wolf 1055 B:VB 10:HD 180617 B"
{
	RA 289.242917
	Dec 5.150278
	Distance 19.2810 # used Gaia DR parallax of A
	SpectralType "M8.0V"
	Radius 86000
	AppMag 17.30
}

"Gliese 754:Luyten 347-14"
{
	RA 290.19993122
	Dec -45.55823034
	Distance 19.2887 # 169.0921 +/- 0.2165 mas
	SpectralType "M4.5V"
	Radius 180000 # approx. for class
	AppMag 12.23
}

76074 # Gliese 588
{
	RA 233.05388594
	Dec -41.27559211
	Distance 19.2983 # 169.0074 +/- 0.0580 mas
	SpectralType "M2.5V"
	Radius 290000 # approx. for class
	AppMag 9.311
}

# parameters from Martin et al. (2018)
"WISE 0350-5658:WISE J035000.32-565830.2"
{
	RA 57.500996
	Dec -56.975638
	Distance 19.317 # 168.84 +/- 8.53 mas
	SpectralType "Y1V"
	Temperature 300
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

# Used Gaia DR2 parallax for B
Barycenter 3821 "Achird:ETA Cas:24 Cas:Gliese 34:ADS 671"
{
	RA 12.274657128 # mass ratio 1.07:0.55
	Dec 57.81608312
	Distance 19.328 # 168.7521 +/- 0.0377 mas
}

# Mass ratio from theoretical values from same source as orbit
"Achird A:ETA Cas A:24 Cas A:Gliese 34 A:ADS 671 A"
{
	OrbitBarycenter "ETA Cas"
	SpectralType "G0V"
	AppMag 3.44

	EllipticalOrbit {
		Period          479.27
		SemiMajorAxis    24.22 # mass ratio 1.07:0.55
		Eccentricity      0.50
		Inclination     152.40
		AscendingNode     8.78
		ArgOfPericenter 182.11
		MeanAnomaly      82.68
	}
}

2026693663 "Achird B:ETA Cas B:24 Cas B:Gliese 34 B:ADS 671 B"
{
	OrbitBarycenter "ETA Cas"
	SpectralType "K7V"
	AppMag 7.51

	EllipticalOrbit {
		Period        479.27
		SemiMajorAxis  47.12 # mass ratio 1.07:0.55
		Eccentricity    0.50
		Inclination   152.40
		AscendingNode   8.78
		ArgOfPericenter 2.11
		MeanAnomaly    82.68
	}
}

Barycenter "Guniibuu:36 Oph:Gliese 663:ADS 10417" # orbit of (AB) & C unknown
{
	RA 258.907618286 # mass ratio (0.75:0.76):0.72
	Dec -26.58414637
	Distance 19.4373
}

# Distance from average of distances from Gaia DR2 parallax for A and B
Barycenter 84405 "Guniibuu AB:36 Oph AB:Gliese 663 AB"
{
	RA 258.837020242 # mass ratio 0.75:0.76
	Dec -26.60226476 # A: 167.8221 +/- 0.1556 mas
	Distance 19.4373 # B: 167.7764 +/- 0.2210 mas
}

# Average masses from Luck, R. E. (2017), AJ 153 (1), 21
# "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants"
# http://iopscience.iop.org/article/10.3847/1538-3881/153/1/21/meta
1003266820 "Guniibuu A:36 Oph A:Gliese 663 A:ADS 10417 A"
{
	OrbitBarycenter "36 Oph AB"
	SpectralType "K2V"
	AppMag 5.08

	EllipticalOrbit {
		Period          470.9
		SemiMajorAxis    38.99 # mass ratio 0.75:0.76
		Eccentricity      0.92
		Inclination      13.35
		AscendingNode   348.86
		ArgOfPericenter 270.97
		MeanAnomaly     246.27
	}
}

2003266820 "Guniibuu B:36 Oph B:Gliese 663 B:ADS 10417 B"
{
	OrbitBarycenter "36 Oph AB"
	SpectralType "K1V"
	AppMag 5.08

	EllipticalOrbit {
		Period         470.9
		SemiMajorAxis   38.48 # mass ratio 0.75:0.76
		Eccentricity     0.92
		Inclination     13.35
		AscendingNode  348.86
		ArgOfPericenter 90.97
		MeanAnomaly    246.27
	}
}

84478 "Guniibuu C:36 Oph C:V2215 Oph:Gliese 664:Gliese 663 C:ADS 10417 C"
{
	RA 259.05567807
	Dec -26.5461481
	Distance 19.4373 # used same distance as A and B
	SpectralType "K5V"
	AppMag 6.34
}

# parameters from Martin et al. (2018)
# BT-Settl model parameters from Beichman et al. (2014), ApJ 783 (2), 68
# "WISE Y Dwarfs as Probes of the Brown Dwarf-Exoplanet Connection"
# https://iopscience.iop.org/article/10.1088/0004-637X/783/2/68/meta
"WISE 1541-2250:WISE J1541-2250:WISEPA J154151.66-225025.2"
{
	RA 235.464061
	Dec -22.840554
	Distance 19.524 # 167.05 +/- 4.19 mas
	SpectralType "Y1"
	Temperature 350
	Radius 69900
	AbsMag 40 # extremely low
}

37766 # Ross 882 
{
	RA 116.16738595
	Dec 3.55246606
	Distance 19.5281 # 167.0186 +/- 0.0592 mas
	SpectralType "M4.0V"
	Radius 180000 # approx. for class
	AppMag 11.225
}

# masses and parallaxes from Benedict et al. (2016), AJ 152 (5), 141
# "The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence
# M Dwarfs"
# http://iopscience.iop.org/article/10.3847/0004-6256/152/5/141/meta
Barycenter 1242 "GJ 1005:Luyten 722-22"
{
	RA 3.86712874
	Dec -16.133786
	Distance 19.577 # 166.6 +/- 0.3 mas
}

"GJ 1005 A:Luyten 722-22 A"
{
	OrbitBarycenter "GJ 1005"
	SpectralType "M3.5V"
	AppMag 11.60

	EllipticalOrbit {
		Period           4.565
		SemiMajorAxis     0.70 # mass ratio 0.179:0.112
		Eccentricity      0.36
		Inclination      72.44
		AscendingNode    85.33
		ArgOfPericenter 182.79
		MeanAnomaly       5.81
	}
}

"GJ 1005 B:Luyten 722-22 B"
{
	OrbitBarycenter "GJ 1005"
	SpectralType "M7V"
	AppMag 14.02

	EllipticalOrbit {
		Period         4.565
		SemiMajorAxis   1.12 # mass ratio 0.179:0.112
		Eccentricity    0.36
		Inclination    72.44
		AscendingNode  85.33
		ArgOfPericenter 2.79
		MeanAnomaly     5.81
	}
}

Barycenter 99461 "Gliese 783:CD-36 13940:J Herschel 5173:HJ 5173" # orbit of A & B unknown
{
	RA 302.7999508  # mass ratio 0.82:0.20
	Dec -36.1014624
	Distance 19.618
}

"Gliese 783 A:CD-36 13940 A:J Herschel 5173 A:HJ 5173 A"
{
	RA 302.79974369
	Dec -36.10120932
	Distance 19.6211 # 166.2274 +/- 0.1256 mas
	SpectralType "K2.5V"
	AppMag 5.32
}

"Gliese 783 B:CD-36 13940 B:J Herschel 5173 B:HJ 5173 B"
{
	RA 302.8008
	Dec -36.10250
	Distance 19.6211
	SpectralType "M3.5V"
	Radius 180000 # approx. for class
	AppMag 11.50
}

15510 # 82 Eri
{
	RA 49.98187890
	Dec -43.06978264
	Distance 19.711 # 165.47 +/- 0.19 mas
	SpectralType "G6V"
	AppMag 4.27
}

# Barry et al. (2012), ApJ 760 (1), 55
# "A Precise Physical Orbit for the M-dwarf Binary Gliese 268"
# http://iopscience.iop.org/article/10.1088/0004-637X/760/1/55/meta
Barycenter 34603 "Gliese 268:Ross 986"
{
	RA 107.50764113
	Dec 38.52946844
	Distance 19.8103 # 164.6395 +/- 0.1338 mas
}

"QY Aur:Gliese 268 A:Ross 986 A"
{
	OrbitBarycenter "Gliese 268"
	SpectralType "M4.5V"
	AppMag 12.05

	EllipticalOrbit {              # fully specified orbit
		Period        0.028547
		SemiMajorAxis  0.03110 # mass ratio 0.22599:0.19248
		Eccentricity    0.3203
		Inclination       8.92
		AscendingNode    66.51
		ArgOfPericenter 161.27
		MeanAnomaly     272.77
	}
}

"Gliese 268 B:Ross 986 B"
{
	OrbitBarycenter "Gliese 268"
	SpectralType "M6V"
	AppMag 12.45

	EllipticalOrbit {              # fully specified orbit
		Period        0.028547
		SemiMajorAxis  0.03641 # mass ratio 0.22599:0.19248
		Eccentricity    0.3203
		Inclination       8.92
		AscendingNode    66.51
		ArgOfPericenter 341.27
		MeanAnomaly     272.77
	}
}

99240 # Del Pav
{
	RA 302.18170612
	Dec -66.18206758
	Distance 19.923 # 163.71 +/- 0.17 mas
	SpectralType "G8IV"
	AppMag 3.56
}

"2MASS 0136+0933:2MASS J01365662+0933473:SIMP J013656.5+093347"
{
	RA 24.23566572
	Dec 9.56314736
	Distance 19.9261 # 163.6824 +/- 0.7223 mas
	SpectralType "T2.5V"
	AbsMag 27.5 # for approximate radius in Celestia
}

# parallax from Faherty et al. (2012), ApJ 752, (1), 56
# "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs"
# http://iopscience.iop.org/article/10.1088/0004-637X/752/1/56/meta
"2MASS 0937+2931:2MASS J09373487+2931409"
{
	RA 144.395333
	Dec 29.528056
	Distance 19.961 # 163.39 +/- 1.76 mas
	SpectralType "T6.0V"
	AbsMag 33.5 # for approximate radius in Celestia
}

99701 # Gliese 784
{
	RA 303.47248496
	Dec -45.16402041
	Distance 20.0932 # 162.3212 +/- 0.0495 mas
	SpectralType "M0V"
	Radius 432000 # approx. for class
	AppMag 7.966
}

"GJ 1221:LP 44-113"
{
	RA 267.03330405
	Dec 70.87664478
	Distance 20.2604 # 160.9819 +/- 0.0143 mas
	SpectralType "DQ9P"
	AppMag 14.15
}

71253 # Gliese 555
{
	RA 218.57004817
	Dec -12.51956038
	Distance 20.3702 # 160.1141 +/- 0.1135 mas
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 11.317
}

# Distance from average of distances from Gaia DR2 parallax for A and B
Barycenter 116132 "Gliese 896:BD+19 5116"
{
	RA 352.96797137 # mass ratio (0.34:0.13):(0.16:0.09)
	Dec 19.93724591 # A: 159.7098 +/- 0.0827 mas
	Distance 20.400 # B: 160.0598 +/- 0.1079 mas
}

Barycenter "Gliese 896 A:BD+19 5116 A"
{
	OrbitBarycenter "Gliese 896"

	EllipticalOrbit {
		Period            359
		SemiMajorAxis    14.92 # mass ratio (0.34:0.13):(0.16:0.09)
		Eccentricity      0.2
		Inclination      19.6
		AscendingNode   138.8
		ArgOfPericenter 119.1
		MeanAnomaly     352.0
	}
}

Barycenter "Gliese 896 B:BD+19 5116 B"
{
	OrbitBarycenter "Gliese 896"

	EllipticalOrbit {
		Period            359
		SemiMajorAxis    28.0 # mass ratio (0.34:0.13):(0.16:0.09)
		Eccentricity      0.2
		Inclination      19.6
		AscendingNode   138.8
		ArgOfPericenter 299.1
		MeanAnomaly     352.0
	}
}

"EQ Peg:Gliese 896 Aa:BD+19 5116 Aa"
{
	OrbitBarycenter "Gliese 896 A"
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 10.27

	EllipticalOrbit {
		Period          3.5 # "of the order of a few years"
		SemiMajorAxis   0.5 # mass ratio 0.34:0.13
		Inclination	 20 # to match orbital plane of system
		AscendingNode   140
		ArgOfPericenter 180
	}

}

"Gliese 896 Ab:BD+19 5116 Ab"
{
	OrbitBarycenter "Gliese 896 A"
	SpectralType "M7V" # from apparent magnitude
	Radius 84000 # approx. for estimated class
	AppMag 13.26

	EllipticalOrbit {
		Period          3.5 # "of the order of a few years"
		SemiMajorAxis   1.2 # mass ratio 0.34:0.13
		Inclination	 20 # to match orbital plane of system
		AscendingNode   140
	}
}

"Gliese 896 Ba:BD+19 5116 Ba"
{
	OrbitBarycenter "Gliese 896 B"
	SpectralType "M4.5V"
	Radius 160000 # approx. for class
	AppMag 12.21

	EllipticalOrbit {
		Period          4.1 # "of the order of a few years"
		SemiMajorAxis   0.6 # mass ratio 0.16:0.09
		Inclination	 20 # to match orbital plane of system
		AscendingNode   140
		ArgOfPericenter 180
	}
}

"Gliese 896 Bb:BD+19 5116 Bb"
{
	OrbitBarycenter "Gliese 896 B"
	SpectralType "M9V" # from apparent magnitude
	Radius 56000 # approx. for class
	AppMag 15.40

	EllipticalOrbit {
		Period          4.1 # "of the order of a few years"
		SemiMajorAxis   1.0 # mass ratio 0.16:0.09
		Inclination	 20 # to match orbital plane of system
		AscendingNode   140
	}
}

74995 # Gliese 581
{
	RA 229.86177972
	Dec -7.72227527
	Distance 20.5454 # 158.7492 +/- 0.0523 mas
	SpectralType "M3V"
	Radius 270000 # approx. for class
	AppMag 10.560
}

# Parameters from Gonzalez-Alvarez et al. (2020), A&A 637, A93
# "The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting 
# HD 79211 (GJ 338 B)"
# https://arxiv.org/abs/2003.13052
# Distance from average of distances from Gaia DR2 parallax for A and B
Barycenter "Gliese 338:Struve 1321:ADS 7251"
{
	RA 138.59872250 # mass ratio 0.69:0.64
	Dec 52.46994924 # A: 157.8796 +/- 0.0366 mas
	Distance 20.658 # B: 157.8851 +/- 0.0414 mas
}

45343 "Gliese 338 A:Struve 1321 A:ADS 7251 A"
{
	OrbitBarycenter "Gliese 338"
	SpectralType "M0.0V"
	Radius 403500
	AppMag 7.63

	EllipticalOrbit {
		Period          1295
		SemiMajorAxis   63.0 # mass ratio 0.69:0.64
		Eccentricity    0.01
		Inclination     123.3
		AscendingNode   348.8
		ArgOfPericenter 184.3
		MeanAnomaly     135.4
	}

	RotationPeriod 391.2 # 16.3 d
}

120005 "Gliese 338 B:Struve 1321 B:ADS 7251 B"
{
	OrbitBarycenter "Gliese 338"
	SpectralType "M0.0V"
	Radius 403500
	AppMag 7.70

	EllipticalOrbit {
		Period          1295
		SemiMajorAxis   67.9 # mass ratio 0.69:0.64
		Eccentricity    0.01
		Inclination     123.3
		AscendingNode   348.8
		ArgOfPericenter 4.3
		MeanAnomaly     135.4
	}

	RotationPeriod 398.64 # 16.61 d
}

"LHS 2090:LP 368-128"
{
	RA 135.09811222
	Dec 21.83469395
	Distance 20.8063 # 156.7584 +/- 0.1329 mas
	SpectralType "M6.5V"
	Radius 105000 # approx. for class
	AppMag 16.100
}

Barycenter 84140 "Gliese 661:BD+45 2505"
{
	RA 258.03296559
	Dec 45.66589325
	Distance 20.865
}

"Gliese 661 A:BD+45 2505 A"
{
	OrbitBarycenter "Gliese 661"
	SpectralType "M3V"
	Radius 270000 # approx. for class
	AppMag 10.02

	EllipticalOrbit {
		Period           12.96
		SemiMajorAxis     2.43 # mass ratio 0.36:0.35
		Eccentricity      0.75
		Inclination      27.34
		AscendingNode    65.56
		ArgOfPericenter 138.70
		MeanAnomaly     248.89
	}
}

"Gliese 661 B:BD+45 2505 B"
{
	OrbitBarycenter "Gliese 661"
	SpectralType "M4V"
	Radius 180000 # approx. for class
	AppMag 10.25

	EllipticalOrbit {
		Period           12.96
		SemiMajorAxis     2.50 # mass ratio 0.36:0.35
		Eccentricity      0.75
		Inclination      27.34
		AscendingNode    65.56
		ArgOfPericenter 318.70
		MeanAnomaly     248.89
	}
}

"LP 944-20"
{
	RA 54.89688549
	Dec -35.42878568
	Distance 20.9398 # 155.7590 +/- 0.0991 mas
	SpectralType "M9.5Ve"
	Radius 56000 # approx. for class
	AppMag 18.69
}

"Gliese 223.2:LP 658-2:HL 4"
{
	RA 88.78971006
	Dec -4.16862949
	Distance 21.0084 # 155.2501 +/- 0.0287 mas
	SpectralType "DZ9" # DZ11
	AppMag 14.45
}

"2MASS 1503+2525:2MASS J15031961+2525196"
{
	RA 225.83171067
	Dec 25.42215925
	Distance 21.0531 # 154.9208 +/- 1.1025 mas
	SpectralType "T5.5V"
	AbsMag 32 # for approximate radius in Celestia
}

Barycenter "Gliese 644:Wolf 630" # orbit of (AB) & C unknown
{
	RA 253.8717855 # mass ratio (0.4155:(0.3466:0.3143)):0.0841
	Dec -8.3405565
	Distance 21.080
}

# Parallax and masses from Segransan et al. (2000), A&A 364, 665
# "Accurate masses of very low mass stars. III. 16 new or improved masses"
# http://adsabs.harvard.edu/abs/2000A%26A...364..665S
Barycenter 82817 "Gliese 644 AB:Wolf 630 AB"
{
	RA 253.86982326
	Dec -8.3363299
	Distance 21.070 # 154.8 +/- 0.6 mas
}

"V1054 Oph:Gliese 644 A:Wolf 630 A"
{
	OrbitBarycenter "Gliese 644 AB"
	SpectralType "M2.5V"
	AppMag 9.73

	EllipticalOrbit {              # fully specified orientation
		Period            1.718
		SemiMajorAxis     0.90 # mass ratio 0.4155:(0.3466:0.3143)
		Eccentricity      0.04
		Inclination      82.15
		AscendingNode   324.51
		ArgOfPericenter 236.42
		MeanAnomaly      63.52
	}
}

Barycenter "Gliese 644 B:Wolf 630 B"
{
	OrbitBarycenter "Gliese 644 AB"

	EllipticalOrbit {             # fully specified orientation
		Period           1.718
		SemiMajorAxis    0.57 # mass ratio 0.4155:(0.3466:0.3143)
		Eccentricity     0.04
		Inclination     82.15
		AscendingNode  324.51
		ArgOfPericenter 56.42
		MeanAnomaly     63.52
	}
}

"Gliese 644 Ba:Wolf 630 Ba"
{
	OrbitBarycenter "Gliese 644 B"
	SpectralType "M3V"
	AppMag 10.54

	EllipticalOrbit {
		Period           0.008125 # 2.965509 d
		SemiMajorAxis    0.0167 # mass ratio 0.3466:0.3143
		Eccentricity     0.02 # axis calculated from mass and period
		Inclination     80.81
		AscendingNode  328.19 # assumed to be identical to A-B
		ArgOfPericenter 79.87
		MeanAnomaly    164.82
	}
}

"Gliese 644 Bb:Wolf 630 Bb"
{
	OrbitBarycenter "Gliese 644 B"
	SpectralType "M4V"
	AppMag 10.63

	EllipticalOrbit {
		Period            0.008125 # 2.965509 d
		SemiMajorAxis     0.0185 # mass ratio 0.3466:0.3143
		Eccentricity      0.02 # axis calculated from mass and period
		Inclination      80.81
		AscendingNode   328.19 # assumed to be identical to A-B
		ArgOfPericenter 259.87
		MeanAnomaly     164.82
	}
}

# Physical parameters from Mann et al. (2015), ApJ 804 (1), 64
# "How to Constrain Your M Dwarf: Measuring Effective Temperature, 
# Bolometric Luminosity, Mass, and Radius"
# http://iopscience.iop.org/article/10.1088/0004-637X/804/1/64/meta
"Gliese 644 C:Wolf 630 C:VB 8"
{
	RA 253.89690059
	Dec -8.39465358
	Distance 21.2046 # 153.8139 +/- 0.1148 mas
	SpectralType "M7V"
	AppMag 16.916
	Radius 78680
}

"GL Vir:GJ 1156:Luyten 1190-34"
{
	RA 184.74749966
	Dec 11.12604729
	Distance 21.1094 # 154.5077 +/- 0.1108 mas
	SpectralType "M4.5V"
	Radius 160000 # approx. for class
	AppMag 13.898
}

80459 # Gliese 625
{
	RA 246.35259712
	Dec 54.30410160
	Distance 21.1144 # 154.4710 +/- 0.0273 mas
	SpectralType "M1.5V"
	Radius 324000 # approx. for class
	AppMag 10.17
}

# parameters from Martin et al. (2018)
# BT-Settl model parameters from Beichman et al. (2014), ApJ 783 (2), 68
# "WISE Y Dwarfs as Probes of the Brown Dwarf-Exoplanet Connection"
# https://iopscience.iop.org/article/10.1088/0004-637X/783/2/68/meta
"WISE 2209+2711:WISE J220905.73+271143.9"
{
	RA 332.273892
	Dec 27.195556
	Distance 21.123 # 154.41 +/- 5.67 mas
	SpectralType "Y0V"
	Temperature 350
	Radius 69900
	AbsMag 40 # extremely low
}

82809 "Gliese 643:Wolf 629"
{
	RA 253.85508989
	Dec -8.32258365
	Distance 21.1901 # 153.9189 +/- 0.1310 mas
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 11.759
}

"GJ 1128:LHS 271:Luyten 100-115"
{
	RA 145.69309184
	Dec -68.88500107
	Distance 21.2090 # 153.7816 +/- 0.0554 mas
	SpectralType "M4.0V"
	Radius 180000 # approx. for class
	AppMag 12.78
}

# parameters from Martin et al. (2018)
"WISE 0410+1502:WISE J041022.71+150248.4"
{
	RA 62.595853
	Dec 15.044417
	Distance 21.259 # 153.42 +/- 4.05 mas
	SpectralType "Y0V"
	Temperature 300 # approx.
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

114622 # Gliese 892
{
	RA 348.32072826
	Dec 57.16835459
	Distance 21.3061 # 153.0808 +/- 0.0895 mas
	SpectralType "K3V"
	AppMag 5.570
}

# BT-Settl model parameters from Beichman et al. (2014), ApJ 783 (2), 68
# "WISE Y Dwarfs as Probes of the Brown Dwarf-Exoplanet Connection"
# https://iopscience.iop.org/article/10.1088/0004-637X/783/2/68/meta
"WISE 0313+7807:WISE J031325.94+780744.3"
{
	RA 048.358100
	Dec 78.128986
	Distance 21.3 # 153 +/- 15 mas
	SpectralType "T8.5V"
	Temperature 651
	Radius 61500
	AbsMag 40 # extremely low
}

"LHS 337:Luyten 471-42:GJ 3737"
{
	RA 189.70457636
	Dec -38.38157547
	Distance 21.7666 # 149.8423 +/- 0.0755 mas
	SpectralType "M4.0V"
	Radius 180000 # approx. for class
	AppMag 12.74
}

# Söderhjelm, S. (1999), A&A 341, 121
# "Visual binary orbits and masses post Hipparcos"
# http://adsabs.harvard.edu/abs/1999A%26A...341..121S
Barycenter 72659 "XI Boo:37 Boo:Gliese 566:ADS 9413"
{
	RA 222.847018
	Dec 19.100634
	Distance 21.893 # 148.98 +/- 0.48 mas
}

1007221481 "XI Boo A:37 Boo A:Gliese 566 A:ADS 9413 A"
{
	OrbitBarycenter "XI Boo"
	SpectralType "G7Ve"
	AppMag 4.675

	EllipticalOrbit {
		Period          151.6
		SemiMajorAxis    13.80 # mass ratio 0.94:0.67
		Eccentricity      0.51
		Inclination      83.21
		AscendingNode   270.13
		ArgOfPericenter 158.75
		MeanAnomaly     215.38
	}
}

2007221481 "XI Boo B:37 Boo B:Gliese 566 B:ADS 9413 B"
{
	OrbitBarycenter "XI Boo"
	SpectralType "K5Ve"
	AppMag 6.816

	EllipticalOrbit {
		Period          151.6
		SemiMajorAxis    19.36 # mass ratio 0.94:0.67
		Eccentricity      0.51
		Inclination      83.21
		AscendingNode   270.13
		ArgOfPericenter 338.75
		MeanAnomaly     215.38
	}
}

53767 # Ross 104
{
	RA 165.01773737
	Dec 22.83295740
	Distance 22.0185 # 148.1283 +/- 0.0569 mas
	SpectralType "M4V"
	Radius 180000 # approx. for class
	AppMag 10.020
}

# Tokovinin et al. (2015), AJ 150 (2), 50
# "Speckle Interferometry at SOAR in 2014"
# http://iopscience.iop.org/article/10.1088/0004-6256/150/2/50/meta
# Delfosse et al. (1999), A&A 344, 897
# "New neighbours. I. 13 new companions to nearby M dwarfs"
# http://adsabs.harvard.edu/abs/1999A&A...344..897D
Barycenter "GJ 3522:Giclas 41-14"
{
	RA 134.734670
	Dec 8.4739078
	Distance 22.088 # 147.66 +/- 1.98 mas
}

Barycenter "GJ 3522 A:Giclas 41-14 A"
{
	OrbitBarycenter "Giclas 41-14"
	SpectralType "M3.5V"

	EllipticalOrbit {
		Period          5.566
		SemiMajorAxis    0.86 # mass ratio (0.19:0.17):0.17
		Eccentricity     0.78
		Inclination    155.71
		AscendingNode  234.28
		ArgOfPericenter 34.91
		MeanAnomaly    303.15
	}
}

"GJ 3522 Aa:Giclas 41-14 Aa"
{
	OrbitBarycenter "Giclas 41-14 A"
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 11.94

	EllipticalOrbit {
		Period          0.021	# 7.6 d
		SemiMajorAxis   0.0255	# estimated from mass ratio 0.19:0.17
		Inclination     156     # guess - to match
		AscendingNode   234     # plane of AB
	}
}

"GJ 3522 Ab:Giclas 41-14 Ab"
{
	OrbitBarycenter "Giclas 41-14 A"
	SpectralType "M6V" # from estimated mass
	Radius 105000 # approx. for estimated class
	AppMag 12.14

	EllipticalOrbit {
		Period          0.021	# 7.6 d
		SemiMajorAxis   0.0285	# estimated from mass ratio 0.19:0.17
		Inclination     156     # guess - to match
		AscendingNode   234     # plane of AB
		ArgOfPericenter 180
	}
}

"GJ 3522 B:Giclas 41-14 B"
{
	OrbitBarycenter "Giclas 41-14"
	SpectralType "M6V"
	Radius 105000 # approx. for estimated class
	AppMag 12.28

	EllipticalOrbit {
		Period           5.566
		SemiMajorAxis     1.83 # mass ratio (0.19:0.17):0.17
		Eccentricity      0.78
		Inclination     155.71
		AscendingNode   234.28
		ArgOfPericenter 214.91
		MeanAnomaly     303.15
	}
}

# Delfosse et al. (1999), A&A 344, 897
# "New neighbours. I. 13 new companions to nearby M dwarfs"
# http://adsabs.harvard.edu/abs/1999A&A...344..897D
Barycenter 106106 "Gliese 829:Ross 775"
{
	RA 322.40338336
	Dec 17.64329431
	Distance 22.0954 # 147.6126 +/- 0.0979 mas
}

"Gliese 829 A:Ross 775 A"
{
	OrbitBarycenter "Ross 775"
	SpectralType "M3.0V"
	Radius 270000 # approx. for class
	AppMag 11.05

	EllipticalOrbit {
		Period          0.146	# 53.2 d
		SemiMajorAxis   0.11	# estimated from mass ratio 0.26:0.26
		ArgOfPericenter 180
	}
}

"Gliese 829 B:Ross 775 B"
{
	OrbitBarycenter "Ross 775"
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 11.05

	EllipticalOrbit {
		Period          0.146	# 53.2 d
		SemiMajorAxis   0.11	# estimated from mass ratio 0.26:0.26
	}
}

# Dupuy et al. (2019), AJ 158 (5), 174
# "WISE J072003.20-084651.2B is a Massive T Dwarf"
# https://arxiv.org/abs/1908.06994
Barycenter "Scholz's Star:WISE 0720-0846:WISE J072003.20-084651.2"
{
	RA 110.01355700
	Dec -8.78052900
	Distance 22.294 # 146.3 +1.2 -1.1 mas
}

# Apparent magnitude of A from Ivanov et al. (2015), A&A 574, A64
# "Properties of the solar neighbor WISE J072003.20-084651.2"
# https://www.aanda.org/articles/aa/abs/2015/02/aa24883-14/aa24883-14.html
"Scholz's Star A:WISE J0720-0846 A:WISE J072003.20-084651.2 A"
{
	OrbitBarycenter "WISE 0720-0846"
	SpectralType "M9.5V"
	AppMag 18.266

	EllipticalOrbit {              # fully specified orbit
		Period            8.06
		SemiMajorAxis     0.87 # mass ratio 99J:66J
		Eccentricity      0.24
		Inclination      59.8
		AscendingNode   158.8
		ArgOfPericenter  39.7
		MeanAnomaly      18.4
	}
}

"Scholz's Star B:WISE J0720-0846 B:WISE J072003.20-084651.2 B"
{
	OrbitBarycenter "WISE 0720-0846"
	SpectralType "T5.5V"
	AbsMag 32 # for approximate radius in Celestia

	EllipticalOrbit {              # fully specified orbit
		Period            8.06
		SemiMajorAxis     1.31 # mass ratio 99J:66J
		Eccentricity      0.24
		Inclination      59.8
		AscendingNode   158.8
		ArgOfPericenter 219.7
		MeanAnomaly      18.4
	}
}

113296 # Ross 671
{
	RA 344.14501970
	Dec 16.55343159
	Distance 22.3992 # 145.6107 +/- 0.0388 mas
	SpectralType "M1.5Ve"
	Radius 324000 # approx. for class
	AppMag 8.638
}

# Used parallax of component B, from Gaia DR2
# Winters et al. (2019), AJ 158 (4), 152
# "Three Red Suns in the Sky: A Transiting, Terrestrial Planet in a Triple 
# M Dwarf System at 6.9 Parsecs"
# https://arxiv.org/abs/1906.10147
Barycenter 14101 "LTT 1445"
{
	RA 45.46325875 # mass ratio 0.257:(0.215:0.161)
	Dec -16.59253611
	Distance 22.4090
}

1006945865 "LTT 1445 A:GJ 3193:LP 771-96:Luyten 730-18:RECONS 4"
{
	RA 45.46412500
	Dec -16.5933611
	Distance 22.4090
	AppMag 11.22
	SpectralType "M3V"
	Radius 186400
}

Barycenter "LTT 1445 BC:GJ 3192:LP 771-95"
{
	RA 45.462666667
	Dec -16.59197222
	Distance 22.4090
}

"LTT 1445 B:GJ 3192 A:LP 771-95 A"
{
	OrbitBarycenter "LTT 1445 BC"
	SpectralType "M4V" # estimate from mass and radius
	AppMag 11.78
	Radius 164200

	EllipticalOrbit {
		Period          36.2
		SemiMajorAxis   3.4096 # mass ratio 0.215:0.161
		Eccentricity    0.50
		Inclination     70.41
		AscendingNode   204.85
		ArgOfPericenter 333.35
		MeanAnomaly     169.06
	}
}

"LTT 1445 C:GJ 3192 B:LP 771-95 B"
{
	OrbitBarycenter "LTT 1445 BC"
	SpectralType "M4V" # estimate from mass and radius
	AppMag 12.64
	Radius 137100

	EllipticalOrbit {
		Period          36.2
		SemiMajorAxis   4.5532 # mass ratio 0.215:0.161
		Eccentricity    0.50
		Inclination     70.41
		AscendingNode   204.85
		ArgOfPericenter 153.35
		MeanAnomaly     169.06
	}
}

"Gliese 299:Ross 619"
{
	RA 122.98983156
	Dec 8.77305088
	Distance 22.4200 # 145.4757 +/- 0.5695 mas
	SpectralType "M4.5V"
	Radius 160000 # approx. for class
	AppMag 12.834
}

# parameters from Martin et al. (2018)
"WISE 1405+5534:WISE J140518.39+553421.3"
{
	RA 211.322480
	Dec 55.572793
	Distance 22.59 # 144.35 +/- 8.60 mas
	SpectralType "Y0V"
	Temperature 400 # guess
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

53020 # Wolf 358
{
	RA 162.71679684
	Dec 6.80812877
	Distance 22.7291 # 143.4971 +/- 0.0626 mas
	SpectralType "M4V"
	Radius 180000 # approx. for class
	AppMag 11.675
}

Modify 51317 # Gliese 393
{
	Radius 305000 # approx. for class
}

"2MASS 2146+3813:2MASS J21462206+3813047"
{
	RA 326.59196805
	Dec 38.21804860
	Distance 22.9603 # 142.0522 +/- 0.0513 mas
	SpectralType "M5V"
	Radius 140000 # approx. for class
	AppMag 12.210
}

Modify 103096 # Gliese 809
{
	Radius 341000 # approx. for class
}

"GJ 3877:LP 914-54"
{
	RA 224.15943498
	Dec -28.16350623
	Distance 23.0196 # 141.6865 +/- 0.1063 mas
	SpectralType "M7.0V"
	Radius 84000 # approx. for class
	AppMag 17.141
}

"GJ 1068:Luyten 230-188"
{
	RA 62.61718071
	Dec -53.60226063
	Distance 23.2047 # 140.5559 +/- 0.0354 mas
	SpectralType "M4.5V"
	Radius 160000 # approx. for class
	AppMag 13.58
}

"GJ 1286"
{
	RA 353.79359235
	Dec -2.38905966
	Distance 23.4122 # 139.3100 +/- 0.1066 mas
	SpectralType "M5.0V"
	Radius 140000 # approx. for class
	AppMag 14.69
}

# parameters from Martin et al. (2018)
"WISE 0825+2805:WISE J082507.35+280548.5"
{
	RA 126.280554
	Dec 28.096545
	Distance 23.461 # 139.02 +/- 4.33 mas
	SpectralType "Y0.5V"
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

# low-quality parallax from Theissen, C. A. (2018), ApJ 862 (2), 173
# "Parallaxes of Cool Objects with WISE: Filling in for Gaia"
# http://iopscience.iop.org/article/10.3847/1538-4357/aaccfa/meta
"WISE 0254+0223:WISE J025409.51+022358.6"
{
	RA 43.5328583
	Dec 2.3989861
	Distance 23.5 # 139 +/- 40 mas
	SpectralType "T8V"
	Temperature 500 # approx.
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}

"V488 Hya:2MASS J08354256-0819237"
{
	RA 128.92721804
	Dec -8.32316374
	Distance 23.5305 # 138.6098 +/- 0.2781 mas
	SpectralType "L6.5V"
	AbsMag 21.5 # for approximate radius in Celestia
}

# Distance from average of distances from Gaia DR2 parallax for A and B
Barycenter "Gliese 105" # orbit of (AB) and C unknown
{
	RA 39.028581069 # mass ratio (0.81:0.082):0.21
	Dec 6.883949884 # A: 138.2084 +/- 0.1436 mas
	Distance 23.591 # B: 138.4637 +/- 0.0886 mas
}

# Masses from Golimowski et al. (2002), AJ 120 (4), 2082
# "The Very Low Mass Component of the Gliese 105 System"
# https://iopscience.iop.org/article/10.1086/301567
Barycenter 12114 "Gliese 105 A"
{
	RA 39.020334067 # mass ratio 0.81:0.082
	Dec 6.886846623
	Distance 23.599 # 138.2084 +/- 0.1436 mas
}

"Gliese 105 Aa"
{
	OrbitBarycenter "Gliese 105 A"
	SpectralType "K3V"
	AppMag 5.81

	EllipticalOrbit {
		Period           61
		SemiMajorAxis  0.11 # mass ratio 0.81:0.082
		Eccentricity   0.67
		Inclination      61
		AscendingNode   356
		ArgOfPericenter 174
		MeanAnomaly     354
	}
}

"Gliese 105 Ab" # SIMBAD calls it GJ 105 C
{
	OrbitBarycenter "Gliese 105 A"
	SpectralType "M7V"
	AppMag 16.77

	EllipticalOrbit {
		Period           61
		SemiMajorAxis  1.13 # mass ratio 0.81:0.082
		Eccentricity   0.67
		Inclination      61
		AscendingNode   356
		ArgOfPericenter 354
		MeanAnomaly     354
	}
}

"BX Cet:Gliese 105 B"
{
	RA 39.06361119
	Dec 6.87164564
	Distance 23.555 # parallax: 138.4637 +/- 0.0886 mas
	AppMag 11.664
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
}

# parameters from Martin et al. (2018)
# BT-Settl model parameters from Beichman et al. (2014), ApJ 783 (2), 68
# "WISE Y Dwarfs as Probes of the Brown Dwarf-Exoplanet Connection"
# https://iopscience.iop.org/article/10.1088/0004-637X/783/2/68/meta
"WISE 2056+1459:WISE J205628.91+145953.2"
{
	RA 314.120498
	Dec 14.998118
	Distance 23.580 # 138.32 +/- 3.86 mas
	SpectralType "Y0V"
	Temperature 407
	Radius 65000
	AbsMag 40 # extremely low
}

"GJ 4274:Luyten 788-34"
{
	RA 335.77915456
	Dec -17.60731501
	Distance 23.6040 # 138.1782 +/- 0.2484 mas
	SpectralType "M4.5Ve"
	Radius 160000 # approx. for class
	AppMag 13.30
}

# Used parallax of component C from Gaia DR2
Barycenter "Gliese 667:CD-34 11626" # orbit of (AB) & C unknown
{
	RA 259.7396833   # mass ratio (0.68:0.59):0.35
	Dec -34.99129014
	Distance 23.6316
}

Barycenter 84709 "Gliese 667 AB:CD-34 11626 AB"
{
	RA  259.7381868
	Dec -34.9897615
	Distance 23.6316 # 138.0171 +/- 0.0918 mas
}

1008507370 "Gliese 667 A:CD-34 11626 A"
{
	OrbitBarycenter "Gliese 667 AB"
	SpectralType "K4V"
	AppMag 5.90

	EllipticalOrbit {
		Period           42.15
		SemiMajorAxis     5.98 # mass ratio 0.68:0.59
		Eccentricity      0.58
		Inclination     136.65
		AscendingNode   305.37
		ArgOfPericenter 183.60
		MeanAnomaly     205.84
	}
}

2008507370 "Gliese 667 B:CD-34 11626 B"
{
	OrbitBarycenter "Gliese 667 AB"
	SpectralType "K5V"
	AppMag 5.90

	EllipticalOrbit {
		Period           42.15
		SemiMajorAxis     7.13 # mass ratio 0.68:0.59
		Eccentricity      0.58
		Inclination     136.65
		AscendingNode   305.37
		ArgOfPericenter   3.60
		MeanAnomaly     205.84
	}
}

"Gliese 667 C:CD-34 11626 C"
{
	RA 259.74511327
	Dec -34.99683693
	Distance 23.6316
	SpectralType "M1.5V"
	Radius 324000 # approx. for class
	AppMag 10.22
}

"WISE 0607+2429:WISEP J060738.65+242953.4"
{
	RA 91.91259273
	Dec 24.49911608
	Distance 23.8166 # 136.9449 +/- 0.6553 mas
	SpectralType "L9V"
	AbsMag 23 # approx. for radius in Celestia
}

# parameters from Martin et al. (2018)
# BT-Settl model parameters from Beichman et al. (2014), ApJ 783 (2), 68
# "WISE Y Dwarfs as Probes of the Brown Dwarf-Exoplanet Connection"
# https://iopscience.iop.org/article/10.1088/0004-637X/783/2/68/meta
"WISE 1738+2732:WISE J173835.53+273259.0"
{
	RA 264.648060
	Dec 27.549749
	Distance 23.936 # 136.26 +/- 4.27 mas
	SpectralType "Y0V"
	Temperature 409
	Radius 64300
	AbsMag 40 # extremely low
}

"2MASS 1507-1627:2MASS J15074769-1627386"
{
	RA 226.94864865
	Dec -16.46114400
	Distance 24.1180 # 135.2332 +/- 0.3274 mas
	SpectralType "L5V"
	AbsMag 21 # for approximate radius in Celestia
}

# Delfosse et al. (1999), A&A 344, 897
# "New neighbours. I. 13 new companions to nearby M dwarfs"
# http://adsabs.harvard.edu/abs/1999A&A...344..897D
Barycenter 83945 "GJ 3991:Giclas 203-47"
{
	RA 257.38142860
	Dec 43.68131523
	Distance 24.2320 # 134.5971 +/- 0.4894 mas
}

"GJ 3991 A:Giclas 203-47 A"
{
	OrbitBarycenter "Giclas 203-47"
	SpectralType "M3.5V"
	Radius 225000 # approx. for class
	AppMag 11.80

	EllipticalOrbit {
		Period          0.04	# 15 d
		SemiMajorAxis   0.6	# estimated from mass ratio 0.3:0.5
		Eccentricity    0.07
		ArgOfPericenter 180
	}
}

"GJ 3991 B:Giclas 203-47 B"
{
	OrbitBarycenter "Giclas 203-47"
	SpectralType "D"
	AbsMag 13.7 # for a 0.5-solar-mass white dwarf

	EllipticalOrbit {
		Period          0.04	# 15 d
		SemiMajorAxis   0.4	# estimated from mass ratio 0.3:0.5
		Eccentricity    0.07
	}
}

3765 # HD 4628
{
	RA 12.09573477
	Dec 5.28061376
	Distance 24.2497 # 134.4990 +/- 0.0890 mas
	SpectralType "K2.5V"
	AppMag 5.74
}

# apparent magnitude from Henry et al. (2006) AJ 132 (6), 2360
# "The Solar Neighborhood. XVII. Parallax Results from the CTIOPI 0.9 m Program:
# 20 New Members of the RECONS 10 Parsec Sample"
# http://iopscience.iop.org/1538-3881/132/6/2360/pdf/1538-3881_132_6_2360.pdf
"GJ 4248:LHS 3746:Luyten 499-46"
{
	RA 330.6223980
	Dec -37.0809310
	Distance 24.287 # 134.29 +/- 1.31 mas
	SpectralType "M3.0V"
	Radius 270000 # approx. for class
	AppMag 11.76
}

Modify 106255 # Wolf 922
{
	Radius 160000 # approx. for class
}

2021 # Bet Hyi
{
	RA 6.43779316
	Dec -77.25424612
	Distance 24.327 # 134.07 +/- 0.11 mas
	SpectralType "G0V"
	AppMag 2.79
}

# Parameters from Bond et al. (2020), ApJ 904 (2), 112
# "Hubble Space Telescope Astrometry of the Metal-poor Visual Binary μ Cassiopeiae:
# Dynamical Masses, Helium Content, and Age"
Barycenter 5336 "MU Cas:30 Cas:Gliese 53"
{
	RA 17.06831127
	Dec 54.9203406
	Distance 24.586 # 132.66 +/- 0.69 mas
}

"MU Cas A:30 Cas A:Gliese 53 A"
{
	OrbitBarycenter "MU Cas"
	SpectralType "G5V"
	AppMag 5.166
	Radius 548900

	EllipticalOrbit {	       # fully specified orientation
		Period          21.568
		SemiMajorAxis   1.4186 # mass ratio 0.7440:0.1728
		Eccentricity    0.5885
		Inclination      25.62
		AscendingNode   344.53
		ArgOfPericenter 124.96
		MeanAnomaly      46.34
	}
}

"MU Cas B:30 Cas B:Gliese 53 B"
{
	OrbitBarycenter "MU Cas"
	SpectralType "MVI"
	AppMag 11.00

	EllipticalOrbit {
		Period          21.568
		SemiMajorAxis   6.1080 # mass ratio 0.7440:0.1728
		Eccentricity    0.5885
		Inclination      25.62
		AscendingNode   344.53
		ArgOfPericenter 304.96
		MeanAnomaly      46.34
	}
}

7981 # 107 Psc
{
	RA 25.62401456
	Dec 20.26851674
	Distance 24.8046 # 131.4903 +/- 0.1515 mas
	SpectralType "K1V"
	AppMag 5.24
}

# Rotational parameters based on disk parameters, from
# MacGregor et al. (2017), ApJ 842 (1), 8
# "A Complete ALMA Map of the Fomalhaut Debris Disk"
# https://arxiv.org/abs/1705.05867
Modify 113368 # Fomalhaut 
{
	UniformRotation
	{
		Inclination    83.2  # rotation pole matches debris disk
		AscendingNode  177.5 # inclination 65.6 deg, position angle 337.9 deg
 	}
}

113283 # TW PsA (Fomalhaut B)
{
	RA 344.10022206
	Dec -31.56556530
	Distance 24.8144 # 131.4380 +/- 0.0856 mas
	SpectralType "K4Ve"
	AppMag 6.48
}

Modify 65859 # Ross 490
{
	Radius 341000 # approx. for class
}

"Giclas 141-36"
{
	RA 282.07307098
	Dec 7.68921596
	Distance 24.8596 # 131.1990 +/- 0.0788 mas
	SpectralType "M5.0V"
	Radius 140000 # approx. for class
	AppMag 14.248
}

"GJ 4053:LP 71-165"
{
	RA 274.73846839
	Dec 66.19258373
	Distance 24.9408 # 130.7722 +/- 0.0443 mas
	SpectralType "M4.5V"
	Radius 160000 # approx. for class
	AppMag 13.406
}

"Fomalhaut C:ALF PsA C:LP 876-10"
{
	RA 342.01871887
	Dec -24.36881191
	Distance 25.0305 # 130.3032 +/- 0.0746 mas
	SpectralType "M4.0Ve"
	Radius 160000 # approx. for class
	AppMag 12.624
}

# rotational parameters from Monnier et al. (2012), ApJL 761 (1), L3
# "Resolving Vega and the Inclination Controversy with CHARA/MIRC"
# https://arxiv.org/abs/1211.6055
Modify 91262 # Vega
{
	SemiAxes [ 1 0.887 1 ] # equatorial radius 12.7% greater than polar

	UniformRotation
	{
		Period         17.04
		Inclination   150.91 # inclination (i) = 6.2
		AscendingNode 208.14 # pole position angle = -58
	}
}

Modify 12781 # Gliese 109
{
	Radius 225000 # approx. for class
}

#========================================================================
# Nearby multiple star with poor Hipparcos parallax

# Used Gaia DR2 parallax for B
Barycenter 55203 "Alula Australis:XI UMa:53 UMa:Gliese 423:ADS 8119"
{
	RA 169.545550
	Dec 31.529289
	Distance 28.4885 # 114.4867 +/- 0.4316 mas
}

# Masses from Fuhrmann et al. (2016), MNRAS 459 (2), 1682
# "Evidence for very nearby hidden white dwarfs"
# https://doi.org/10.1093/mnras/stw760
Barycenter 1026342520 "Alula Australis A:XI UMa A:53 UMa A:Gliese 423 A:ADS 8119 A"
{
	OrbitBarycenter "Alula Australis"

	EllipticalOrbit {            # fully specified orientation
		Period         59.88
		SemiMajorAxis   9.65 # mass ratio (0.98:0.38):(0.88:0.17)
		Eccentricity    0.40
		Inclination    14.09
		AscendingNode 192.13
		ArgOfPericenter 9.70
		MeanAnomaly    29.62
	}
}

Barycenter 2026342520 "Alula Australis B:XI UMa B:53 UMa B:Gliese 423 B:ADS 8119 B"
{
	OrbitBarycenter "Alula Australis"

	EllipticalOrbit {              # fully specified orientation
		Period           59.88
		SemiMajorAxis    12.50 # mass ratio (0.98:0.38):(0.88:0.17)
		Eccentricity      0.40
		Inclination      14.09
		AscendingNode   192.13
		ArgOfPericenter 189.70
		MeanAnomaly      29.62
	}
}

"Alula Australis Aa:XI UMa Aa:53 UMa Aa:Gliese 423 Aa"
{
	OrbitBarycenter "Alula Australis A"
	SpectralType "G0V"
	AppMag 4.33

	EllipticalOrbit {             # fully specified orientation
		Period          1.834
		SemiMajorAxis    0.13 # mass ratio 0.98:0.38
		Eccentricity     0.61
		Inclination     146.3
		AscendingNode   203.8
		ArgOfPericenter 285.2
		MeanAnomaly      73.4
	}
}

"Alula Australis Ab:XI UMa Ab:53 UMa Ab"
{
	OrbitBarycenter "Alula Australis A"
	SpectralType "M2V" # from mass estimate of 0.38
	AbsMag 10.3 # for estimated spectral class

	EllipticalOrbit {             # fully specified orientation
		Period          1.834
		SemiMajorAxis    0.34 # mass ratio 0.98:0.38
		Eccentricity     0.61
		Inclination     146.3
		AscendingNode   203.8
		ArgOfPericenter 105.2
		MeanAnomaly      73.4
	}
}

"Alula Australis Ba:XI UMa Ba:53 UMa Ba:Gliese 423 Ba"
{
	OrbitBarycenter "Alula Australis B"
	SpectralType "G0V"
	AppMag 4.8

	EllipticalOrbit {
		Period          0.0109 # 3.981 d
		SemiMajorAxis   0.008  # mass ratio 0.88:0.17
		Eccentricity    0
		Inclination     102 # plane-of-inclination:
		AscendingNode   70  # 12.7 deg
		ArgOfPericenter 180
	}

	UniformRotation {
		Inclination     102 # guess, to match orbit
		AscendingNode   70
	}
}

"Alula Australis Bb:XI UMa Bb:53 UMa Bb:Gliese 423 Bb"
# Fuhrmann et al. (2016) suggest it could be a white dwarf
{
	OrbitBarycenter "Alula Australis B"
	SpectralType "D"
	AbsMag 11.3 # for approximate radius in Celestia

	EllipticalOrbit {
		Period          0.0109 # 3.981 d
		SemiMajorAxis   0.056  # mass ratio 0.88:0.17
		Eccentricity    0
		Inclination     102 # plane-of-inclination:
		AscendingNode   70  # 12.7 deg
	}

	UniformRotation {
		Inclination     102 # guess, to match orbit
		AscendingNode   70
	}
}

# Gaia DR2 suggests WDS J11182+3132C is an optical pair
# Wright et al. (2013), A T8.5 Brown Dwarf Member of the xi Ursae Majoris System"
# https://iopscience.iop.org/1538-3881/145/3/84/
"Alula Australis C:WISE 1118+3125:WISE J111838.70+312537.9"
{
	RA 169.66125400
	Dec 31.42720000
	Distance 28.4885
	SpectralType "T8.5V"
	Temperature 600 # approx.
	Radius 60000 # approx.
	AbsMag 40 # extremely low
}